The Turtle and the Eagle

• Chapter 1 The Oak and the Inventor
• Chapter 2 A Connecticut Volunteer
• Chapter 3 The Mechanics of Secrecy
• Chapter 4 Gathering of the Fleet
• Chapter 5 Trials in the Shallows
• Chapter 6 Shadow over Manhattan
• Chapter 7 Phosphorescence and Iron
• Chapter 8 Whispers in the Battery
• Chapter 9 The Eagle's Shadow
• Chapter 10 Ballast and Breath
• Chapter 11 Night of the Ebb Tide
• Chapter 12 Slipping into the Sound
• Chapter 13 The Current's Grip
• Chapter 14 Below the British Line
• Chapter 15 Darkness in the Hull
• Chapter 16 The Copper Sheathing
• Chapter 17 The Slipping Screw
• Chapter 18 Fading Air
• Chapter 19 Cast Adrift
• Chapter 20 Sighting on the Water
• Chapter 21 The Fuse Burns Down
• Chapter 22 Fire on the Hudson
• Chapter 23 The Scramble for the Shore
• Chapter 24 Reckoning in the Shallows
• Chapter 25 Unbroken Resolve
• Chapter 26 Beneath the Tides of War

The Connecticut River in the spring of 1775 smelled of melting hemlock grease, wet shale, and fresh horse manure churned into cold mud by men who were suddenly in a great hurry to shoot at their cousins. Upstream, in the tidy village of Saybrook, David Bushnell smelled mostly of stale turpentine and wood smoke. He had the kind of long, mournful face that suggested its owner had spent forty years contemplating original sin, though in truth Bushnell was barely past thirty and contemplated mostly the displacement of water and the eccentricities of small springs.

He sat on a three-legged stool inside an outbuilding that had once cured pork and was now dedicated to blasphemies against standard carpentry. Around him lay curved billets of Connecticut white oak, seasoned until they were hard as iron teeth, smelling sourly of the forest floor. A tallow lamp threw long, jittering shadows across the beams overhead, catching the gleam of brass petcocks, small pig-iron weights, and a collection of chisels sharpened until their edges were practically invisible.

The news from Massachusetts had arrived ten days earlier, brought by an apothecary’s boy on an exhausted roan. British regulars had marched on Concord; men had died along the road; the militia was encircling Boston like terriers round a badger’s hole. In the town tavern, men were shouting about liberty, tyranny, and the blood of freeborn Englishmen, their patriotism fueled by generous tankards of hard cider. David had listened to three speeches, felt the cold breeze coming off the sound through the open tavern door, and gone straight home to lock himself in with his wood shavings.

Speeches did not move forty-four-gun ships of the line. Speeches did not pierce three feet of seasoned English oak or drown seven hundred sailors who had been trained since childhood to look down upon provincials as a particularly dim variety of cabbage.

"They have the fleet, Ezra," David had told his brother that very morning over a breakfast of cold hasty pudding. "The colonies have a few dozen schooners, some cod-fishing smacks, and an infinite supply of high-minded indignation. If you drop a hogshead of indignation into New York Harbor, it does not sink a frigate. It merely floats away on the tide."

Ezra Bushnell, who possessed his brother's dark eyes but considerably more meat on his ribs, had merely scraped the bottom of his trencher. Ezra was a sensible man who understood farming, blacksmithing, and his brother’s peculiarities, in roughly that order. He knew better than to argue when David had that glassy, mathematical look in his pupils.

Now, David leaned over his workbench and touched a thumb to a brass screw. It was not a screw meant to hold two boards together. It was five inches broad, forged with a delicate spiral pitch, mounted upon an iron shaft that ended in a pair of bevel gears. If one turned the handle inside the hull, the screw turned in the water outside. It was a water-screw, the sort of thing Archimedes had sketched to irrigate Egyptian onions, turned backward upon itself to push rather than pull.

"Archimedes was an ancient," a tutor at Yale had told David two years before, peering over his spectacles at a similar brass model. "A brilliant pagan, to be sure, but a theorist. Nature, Mr. Bushnell, demands that boats be moved by the wind upon their canvas or the sweat of men upon an oar. To push against the water with a toy windmill is an offense against natural economy."

David had smiled his small, noncommittal smile, taken his model back to his lodgings, and dropped it into a tub of rainwater. When he turned the crank, the toy had shot across the zinc tub and bumped smartly against the far side, sending up a miniature wave that thoroughly soaked the tutor’s borrowed copy of Newton's Principia.

The problem was never the propulsion. Any schoolboy who had ever watched a trout scull through an eddy with a flick of its tail understood propulsion. The problem was the air, the water, and the immense, crushing stupidity of human weight.

David picked up a plumb line and let the lead drop toward the packed dirt floor. The hull taking shape in the center of the barn looked like nothing that had ever touched the Atlantic. A shipwright from New London who had happened to peek through a knot-hole two weeks earlier had crossed himself and hurried away, convinced that the Bushnell boys were constructing a heathenish coffin for a giant dwarf.

It was shaped like two enormous turtle shells clapped together, seam to seam, then stood on end. It was five and a half feet tall from the iron skeg at the bottom to the small brass hatch-coaming at the top, and barely three feet broad at its widest beam. An ordinary man could sit inside on a narrow oak slat, provided he had no objection to his knees nudging his chin and his elbows scraping the hull at every movement.

David stood up, the joints of his knees cracking like dry pine, and walked over to the monstrosity. He laid a pale palm against the oak staves. They were four inches thick, held together by broad iron bands that Ezra had beaten out at the forge until his apron was charred black. Each stave had been planed, scraped, boiled in lye, and fitted with tongue-and-groove joints caulked with tarred oakum. It was sealed as tight as a Madeira cask, which was precisely what it was—a barrel designed to carry not wine, but a single, stubborn human soul into the dark where only crabs and drowned sailors went.

"The seal will hold," David muttered to the empty barn. "The wood will swell tight under pressure. It is the pressure itself that wants calculating."

He had already tested the small scale models in a horse trough behind the orchard. At six feet of depth, water had a mischievous desire to find the smallest pinprick, the most microscopic grain of rotten sapwood, and enter it with the hiss of a dying adder. At twenty feet, the water would not merely enter; it would crush the staves inward like an egg beneath an iron boot-heel.

A soft knock came at the heavy bar of the shed door. Three taps, then two.

David lifted the bar, letting in a swirl of damp river air and his brother. Ezra carried an earthen crock of small beer and an oily leather rag that smelled sharply of sulfur.

"They've set watches on the road down from Hartford," Ezra said, setting the beer down on the bench among a litter of brass shavings. "Committees of Safety. Every farmer with a rusty fowling piece thinks he’s a general now. Old man Griswold asked me twice if you were still working on that pump for the salt-pans."

"Let them think it is a pump," David said. "The world is full of pumps. No one ever hanged a man for patenting a brass valve."

"They might hang a man for this," Ezra remarked. He didn't say it with fear; he said it with the quiet matter-of-factness of a man noting that it was likely to rain before sundown. He walked around the wooden hull, his fingers trailing over the smooth, blackened oak. "I finished the rudder hinges. Iron’s soft, though. Had to work with bog-ore. If you strike a ledge at three knots, the pin will sheer right through."

"At three knots, Ezra, a man will not be striking ledges. He will be drifting with the bottom current. If he strikes anything, it will be the copper-sheathed bottom of the King's flagship."

Ezra picked up a brass petcock, turning the key between his rough, calloused fingers. "You're still certain about the powder?"

David’s face brightened, the melancholy briefly lifting from his features like fog burnt away by the sun. "It is the only part that is entirely simple. Fire requires air; everyone knows this. A candle dies in a closed bell-jar. But gunpowder contains its own breath. It does not need the sky. I proved it in the creek last November, before the freeze."

"You killed four of Deacon Mather’s geese," Ezra said.

"The geese were trespassing," David replied smoothly. "And the explosion was under five feet of ice. A wooden box, two pounds of best French pistol powder, a flintlock striker with an iron trip-wire. The concussion cracked the ice thirty paces out. If two pounds does that to ice, a hundred pounds placed directly against the deadwood of an eighty-gun ship will blow her timbers into kindling before the watch can spit his tobacco."

Ezra took a pull from the crock of small beer, wiping his mouth with the back of his hand. "And the man inside? The one who turns the crank?"

David did not answer immediately. He picked up a square of chalk and drew a rough ellipse on the oak planking of the bench.

"The hull has two feet of air when the hatch is dogged," David said, pointing with the chalk. "A man breathes twenty times in a minute. More if he is frightened, but we must find a man who is not frightened. In that space, there is air enough for half an hour. Perhaps three quarters if his blood runs cold and he keeps his mouth shut. In forty minutes, the air becomes thick. Like the bottom of an old well. A candle goes out first. When the candle dies, he has five minutes to find the surface before his brain turns to curd."

"A comforting calculation," Ezra said. "I shall look forward to the voyage."

"You will not make it," David said, his voice dropping into the cool, absolute register he used when discussing Euclid. "You are too thick across the shoulders. Your knuckles would strike the framing every time you turned the horizontal screw. The pilot must be small, short-legged, and possessed of a particular kind of stubbornness that does not show itself in shouting."

"Where do you propose to find such an animal? Harvard?"

David gave a short, dry bark that passed for a laugh. "God forbid. Scholars have too much imagination. An imaginative man inside this cask would drown of fright five feet beneath the river, long before the water ever reached his boot-tops. He would imagine the ocean sitting upon his head. He would hear the seams groan and think the world was ending."

He walked over to the side of the hull where a small circular opening had been cut through the wood, framed in lead. Through this hole passed a rod connected to a brass pump on the floor.

"Here," David said, pointing. "This is the true secret. Not the screw. Not the powder. This."

Ezra looked at the brass cylinder. It was a common force-pump, similar to those used in the bilges of merchantmen, but constructed with obsessive precision.

"To sink," David explained, his fingers tracing the cold metal, "the pilot steps on this spring-latch with his heel. A valve opens in the bottom. River water enters into the false belly here, beneath the foot-boards. Two hundred pounds of water. The vessel loses her buoyancy. She settles until only the little brass crown is above the river, like a teal duck resting on a pond. If he takes in thirty pounds more, she disappears. Completely."

"And when he wants to come up?"

"He pumps it out," David said. "With his hands. Two strokes of the handle for every pint. It will take five minutes of hard labor to lift her again. If the pump fails, he unpins the lead ballast from the keel. There are ninety pounds of pig-iron slotted underneath the skeg. He turns a screw inside, the iron falls away into the mud, and the wood brings him to the top like a cork from a bottle."

Ezra looked at the dark wood, then down at his own broad boots. "Unless the screw binds. Or the lead sticks in the mud."

"Everything sticks in the mud eventually, Ezra. That is why God gave men horses."

David picked up a tin lantern and held it near the open hatch-hole at the top of the machine. Inside, the space was terrifyingly narrow. A small wooden seat, suspended from the framing by iron straps, sat dead center. Before it hung the crank handles for the two screws: one for moving forward and backward, one for lifting or depressing the vessel through the vertical plane. To the right was the rudder-whip; to the left, the petcocks for the water gauges. Two small tubes of thin brass rose through the top plate, fitted with cork floats inside glass sleeves—the water-gauges, David’s own invention, designed to show how deep the barrel hung beneath the light.

It was an engine of pure logic, built out of timber and sweat, dropped into an empire that was currently tearing itself apart over stamps and tea.

"We need more lead," David said, his mind already skipping past the mechanics to the arithmetic of procurement. "We need sixty pounds for the trim weights. The selectmen won't give us the lead from the meeting-house roof; they say it belongs to the militia for musket balls."

"I could talk to the blacksmith in Lyme," Ezra suggested. "He has an old ship’s kettle that’s mostly lead and antimony. He might trade it for two cords of ash."

"Get it," David said. "And Ezra—bring some tallow. Not sheep’s tallow. It stinks too high in a small space. Get beef grease from the slaughter-house. I need to lard these leather collars on the screw-shafts until they move as smooth as goose grease. If water weeps through the stuffing-boxes while we're ten feet under, it will fall directly onto the flint-lock."

Ezra nodded, took a last swig of the beer, and turned toward the door. As he lifted the latch, he paused, looking back at the strange wooden shape that dominated the shadows.

"The wind’s coming out of the south," the brother said quietly. "Blowing straight up from the sound. They say the fleet in Halifax is preparing to move. By midsummer, David, they won’t be in Boston. Boston’s a trap and Howe knows it. They’ll come for New York. That’s where the deep water is. That’s where the ships will lie."

"Let them come," David Bushnell whispered, his hands returning to the oak staves, feeling the cold, smooth contour of the wood. "The water is just as deep for them as it is for us."

Ezra Lee had a blister on the ball of his right foot that was rapidly turning into an independent republic. It had begun two miles outside of New London as a dull rub against cheap cowhide, flourished through the stony lanes of Waterford, and by the time he crested the rise above Saybrook, it commanded his undivided attention. He had marched forty miles in two days on boiled salt beef and parched corn, carrying a French fowling piece that pulled like an anchor, thirty-six rounds of hand-cast ball in a greased leather pouch, and a wool blanket that held rainwater with the stubborn tenacity of a peat bog.

He was twenty-six years old, stood five feet five inches in his wool stockings, and possessed the dense, knotty musculature of a man who had pulled stumps out of the rocky hills of Lyme since he was old enough to hold a spade. The Lee family had lived along the mouth of the Connecticut River for four generations, producing sober farmers, an occasional deacon, and a long lineage of short, thick-shouldered men who did not complain about bad weather because bad weather was considered inevitable and complaining was bad for the digestion.

Ezra had joined the Continental Army not because of Patrick Henry’s ringing phrases—the local gazette arrived in Lyme three weeks late, if at all, and usually smelled of fish—but because Samuel Parsons had stood up on the steps of the meetinghouse and told them all that King George had closed Boston Harbor and was like to send Highlanders to burn their hay-barracks. A man could tolerate a great many things from a king across the sea, including customs collectors who took bribes and judges who wore powdered wigs, but the prospect of foreign soldiers among the hay-barracks was intolerable. Hay was hard to cut and harder to dry, and a man’s hay belonged to his own cows.

Now he was a sergeant in Parsons’s 10th Continental Regiment, though what that title meant in the damp spring of 1775 was largely a matter of theological debate. It meant he had three copper buttons sewn to his left sleeve to distinguish him from the privates, whose sleeves were bare, and it meant that when the men were ordered to sleep in a muddy ditch, Ezra was expected to find the dry end of the ditch and then offer it to an ensign from Norwich who did not yet know which end of a musket spat lead.

He paused near a low fieldstone wall, leaned against a mossy boulder, and eased his boot off. The heel of his hand was raw from his pack straps. The Connecticut Sound lay off to his left, hidden behind a low gray haze that smelled of wet sedge and clams.

"Sergeant Lee," a dry voice called from the road ahead.

Ezra looked up, hopping slightly on one stockinged foot. Lieutenant Thomas Grosvenor was sitting astride a bay gelding that looked as if it had been borrowed from a plough and resented the change of occupation. Grosvenor was twenty-three, the son of a Pomfret magistrate, and carried himself with the rigid, slightly desperate dignity common to young men who had purchased their commissions two weeks before the world went mad.

"Sir," Ezra said, hastily pulling the boot back over his swollen heel. The leather bit into the raw flesh, and he kept his face as blank as a pine board.

"The colonel wishes to see you. At the tavern in Saybrook." Grosvenor turned the horse’s head with a jerky pull of the reins, nearly backing the beast into an elderberry bush. "You are to report directly. Wash the mud off your gaiters first, if you please. General Washington is expected in New York before the month is out, and we cannot look like a pack of turnip vendors."

"I am a turnip vendor, sir," Ezra remarked, though he said it quietly enough that the gelding’s hoof-beats drowned the words. He picked up his musket, slung his pack, and set off down the track toward the village.

Saybrook’s tavern was not an establishment that encouraged vanity. It was a broad, unpainted saltbox with small-paned windows that rattled in the wind off the river, and its sign—a faded painting that was supposed to be a white hart but looked rather like an anemic hog—creaked mournfully on its iron pintles. A half-dozen horses were tied to the hitching rail outside, tails flicking against the spring gnats.

Inside, the air was thick with the scent of spruce beer, frying lard, and wet broadcloth. At the back corner table, near an enormous hearth of river boulders, sat Colonel Samuel Holden Parsons. He was a tall, bony man with a beak of a nose and cold, intelligent eyes that did not miss much between Hartford and the sea. Across from him sat a stranger in a dark coat of homespun wool. The stranger was thin, with pale, ink-stained fingers and a sharp, nervous habit of glancing toward the tavern door whenever the latch lifted.

"Sergeant," Parsons said, cutting a chunk of salt cheese with his pocketknife. He did not look up from the wheel of cheese. "Shut that door against the damp. My knees ache enough without the whole Atlantic blowing through the crack."

Ezra closed the door, stamped his boots twice on the pine floorboards to knock off the worst of the road mud, and pulled off his brimmed hat. "Sergeant Lee, reporting as ordered, Colonel."

Parsons chewed his cheese with slow deliberation. He was a lawyer by trade, a graduate of Harvard, and he possessed the lawyer’s habit of regarding every man as a witness who might, with proper handling, be induced to confess to sheep-stealing.

"Sit down, Ezra," Parsons said. He gestured with the greasy tip of his knife toward an empty bench. "Drink some beer. You look like a starved herring."

Ezra sat, keeping his spine straight against the high back of the bench. The thin stranger in the dark coat did not move, but his dark, deep-set eyes fastened on Ezra’s chest, measuring him from collarbone to knee with the cool dispassion of a tailor estimating yardage.

"This is David Bushnell," Parsons said, nodding toward the pale man. "He attended Yale College. He thinks about strange matters, but his mother was a Griswold, which means he is at least half-sane on his better days. David, this is Ezra Lee. He served with the militia at Boston. He can march thirty miles on a crust of bread, he does not steal army mutton when the officers are looking, and he possesses fewer teeth than common sense, which is rare in a sergeant."

"My teeth are all there, Colonel," Ezra said, mildly offended.

"Then keep your mouth closed and save them," Parsons replied. He turned his attention to Bushnell. "Well, David? Is he small enough, or must I fetch a drummer boy out of the fife corps?"

David Bushnell leaned forward over the table. When he spoke, his voice had the dry, rustling quality of dry leaves scraping over flagstones. "Show me your hands, Sergeant."

Ezra blinked. He had been inspected by officers who wanted to see if his flint was knapped, if his powder was dry, or if his cartridge box contained the regulation number of paper tubes, but no one had ever asked to see his palms. He held them out across the rough pine table. They were broad, square-cut hands, deeply lined with garden dirt and yellowed calluses along the inside of the thumbs from twenty years of holding an ax-helve and a scythe.

Bushnell reached out with fingers that felt cold and dry, like old parchment. He turned Ezra’s hands over, pressing lightly on the meat of the palms, testing the thick pads of tendon at the base of the thumbs.

"He has the grip," Bushnell murmured, almost to himself. "A blacksmith’s grip, but shorter in the finger. That is good. The horizontal crank has an eight-inch throw. If a man has long fingers, his knuckles will rap against the compass housing at every half-turn."

"I am right here, sir," Ezra said, withdrawing his hands by an inch. "I can hear you plain."

Bushnell looked up, meeting Ezra’s eyes for the first time. There was an odd, burning intensity behind the scholar’s spectacles—the look of a preacher who had seen the New Jerusalem, or a madman who had found a new way to skin an eel.

"Can you swim, Sergeant Lee?" Bushnell asked.

"Like a stone," Ezra answered honestly. "I can keep my head above water long enough to holler three times if a skiff overturns, but my father always said water was meant for shipping lumber and drowning kittens. A Christian belongs on the dirt."

Parsons gave a short, dry chuckle and reached for his pewter mug. "You see, David? Perfectly suited. A man who can swim always has some ridiculous notion of saving himself. A man who cannot swim knows that if he fails, he goes straight to the bottom, which gives him a powerful inducement to pay attention to your levers."

"This is not a matter for jest, Colonel," Bushnell said sharply, his gaze never leaving Ezra’s face. "Sergeant, what were you told concerning this summons?"

"Nothing, sir. Lieutenant Grosvenor told me to scrape my boots and run."

"The British have thirty ships of the line riding off Halifax," Bushnell said, speaking slowly, as if addressing a child or a selectman. "Each carries between sixty and eighty heavy guns. They have five thousand men-of-war’s men, trained to run out a twenty-four-pounder in two minutes. If they come down the coast to the Hudson, as every intelligence indicates they will, they can lie off Manhattan and batter the town into shingles before General Washington can bring a single battery to bear."

"I have seen the Asia," Ezra remarked. "Lying off the Battery last winter. She looked like a wooden mountain with three churches stuck on top."

"A wooden mountain," Bushnell agreed, the ghost of a smile touching the corners of his mouth. "Very good. But a mountain is made of earth, and it sits upon the bedrock. A ship is made of wood, and it sits upon the water. It floats because the water beneath it is heavier than the oak and iron inside it. If you make a hole in the bottom of that mountain, the water goes in, the air goes out, and the mountain ceases to exist."

"Any fool with an eighteen-pound ball can tell you that," Ezra said. "The trouble is getting the ball to the bottom of the mountain while the mountain is shooting sixty guns at you."

"You do not bring the ball with a gun," Bushnell whispered. He leaned closer across the table. The tavern around them was noisy with the sounds of militia captains bickering over flour barrels, but Bushnell’s voice seemed to pull the silence toward it like an eddy. "You carry it beneath the water. You go under their keels, where their cannons cannot depress, where their watchmen cannot see, where they believe they are as safe as God in heaven. You attach an engine of powder to the deadwood of their rudder, you light the fuse, and you leave them to their prayers."

Ezra stared at the inventor. Then he glanced at Colonel Parsons, expecting to see the colonel winking or reaching for his pipe to signify that the joke was done. But Parsons was looking into his ale, his face unusually grim.

"You want me to go under the water," Ezra said. The words tasted flat, like stale well water.

"Inside a machine," Bushnell said. "Built of seasoned white oak and banded with charcoal-cured iron. It carries its own breath for thirty minutes. It has an oar that turns by a crank, like the wheel of a cider press, to push it forward, and another to drive it down or lift it up. It has two brass pumps to clear the bilge, and a compass that glows in the dark by the light of foxfire."

"Foxfire," Ezra repeated. "The rotten wood from the swamp?"

"The very same. It produces a cold light. A candle would consume the pilot’s air in seven minutes. Foxfire gives off no smoke, requires no draft, and shines like the eye of an owl." Bushnell’s voice had quickened, rising into that high, feverish pitch of an inventor who had lived with an idea so long that it had become more real to him than bread. "You sit upon a bench of sweet pine. You look through small thick plates of glass set into the crown. You govern the helm with your arm beneath your knee, you turn the horizontal screw with your right hand, you pump the water ballast with your left, and you regulate the depth-gauge with your eyes."

Ezra considered this for a long moment. He looked down at his right boot, where the blood from his blister was beginning to seep through the worn upper.

"It sounds like a butter-churn, sir," Ezra said mildly. "Only with a man inside instead of cream."

Parsons barked with laughter, slapping his thigh with a hand as big as a salt-pork flank. "A butter-churn! By God, David, I told you he had common sense! You’ve spent two years talking about Archimedes and Torricelli, and the boy calls it a butter-churn!"

Bushnell did not laugh. His pale forehead wrinkled with a sudden, fierce impatience. "It is an engine of navigation, Sergeant. It is built to save this continent from subjugation. If we can destroy one ship of the line—only one, the flagship, the admiral’s own hearth—their entire fleet will pull up their anchors and fly out of the harbor like crows from a cornfield. An empire cannot fight an enemy it cannot see. It will break their nerve."

"The British nerve," Ezra observed, "takes a deal of breaking. I was at the bridge in Concord. When our boys were firing from behind the stone walls, the redcoats didn't run. They closed their ranks, stepped over their dead, and kept their drums going. They're stubborn folk, sir. Mostly because they're stupid, but stubborn all the same."

"Are you afraid, Lee?" Parsons asked, his voice suddenly hard. The colonel had dropped the role of drinking companion; he was the magistrate again, the regimental commander who could sign a paper that would send a man to rot in the prison hulks or stand before a firing party at dawn.

Ezra looked the colonel straight in his sharp gray eyes. "I am scared of small spaces, Colonel. I don't like an old cellar where the floorbeams sag, and I don't care much for a well when you have to go down in the bucket to clear the mud. A man was made to have the sky above his hat. But I took the Colony's dollar, and I took the oath on the Book before Squire Griswold. If you order me into the barrel, I’ll get in the barrel. But I won't pretend I think it’s a Christian way to die."

Bushnell shook his head, his tone softening slightly. "It is not a command, Sergeant. Colonel Parsons understands that, even if you do not. A man cannot be commanded to do this. A drafted man would drop the ballast screw the moment the hatch was dogged and the river went black. He would come screaming to the top like a trout on a line. The man who pilots the Turtle must go of his own will, because he understands what hangs upon the cast."

"The Turtle?" Ezra asked. "Is that what you call it?"

"The people who have seen her from a distance call her that," Bushnell admitted. "Because of her shells. She looks like a pair of snapping turtles clapped together, breast to breast."

"A snapping turtle," Ezra muttered, rubbing his blister through the leather. "They don't let go till it thunders, either."

The tavern room had grown louder. A courier had just arrived from New Haven, his coat white with dust, shouting through the taproom that the British had evacuated Boston by sea, carrying twelve hundred Tories and all the town’s silver plate with them, and that their sails had disappeared toward the northeast. Every man in the room was on his feet, waving tankards and roaring about the hand of Providence.

Parsons didn't join them. He watched the courier through the smoke, then turned back to the quiet table in the corner.

"Boston is empty," Parsons said in a low voice. "Which means Howe is refitting in Halifax. When the spring gales blow out, he will turn south. He cannot take the Carolinas; they have no ports deep enough for his three-deckers. He cannot take Philadelphia from the sea because of the river forts and the shallows. He is coming to New York, Ezra. He will bring ten thousand regulars and two hundred sail. If we do not stop them in the Narrows, the continent is cut in two. New England will be sliced off like a rind of cheese."

Ezra looked from the colonel’s lined, hard face to David Bushnell’s pale, intent eyes. He thought of his mother’s kitchen in Lyme, the dried apples hanging from the rafters, the sound of the surf breaking on the sand bar across the cove on autumn nights. He thought of his older brother, who had died of the camp fever at Louisbourg twenty years ago and was buried under a pile of beach cobbles that nobody visited anymore.

"Where is it?" Ezra asked.

"Up the river," Bushnell said. "On the island near the mouth of the Pochaug. Ezra—my brother Ezra—has been testing the hull in the creek. But he has been taken with the lung-rot. He spat blood yesterday after three hours at the pump. He cannot stand the foul air inside the wood. If we cannot find another man to work the cranks, the machine will rot in the barn before the King's ships ever sight Sandy Hook."

"Your brother's name is Ezra?" the sergeant asked.

"Ezra Bushnell," the inventor said. "A good man. But his lungs are thin."

Ezra Lee sighed. He pulled his foot back under the bench, wincing as the raw skin scraped against his stocking.

"Two Ezras," he said. "Seems like a waste of a good name if one of us gets drowned in a tub. When do we start?"

"Now," David Bushnell said, rising so quickly his chair legs shrieked against the pine floor. "The moon is four days past full. The tide turns in the creek at sunset. If we reach the island before dark, I can show you how to set the foot-valve before the fog comes up from the sound."

Parsons reached into his waistcoat, pulled out a silver coin—a Spanish pillar dollar, heavy and bright—and dropped it onto the wood between them. It landed with a clean, clear ring that cut through the tavern's roar.

"That's for your boots, Sergeant," Parsons said. "Buy a pair with thick tallow in the seams. You'll spend more time with wet feet than any man in the army."

Ezra picked up the coin. It was cold, having come from the colonel's pocket, but it had weight. He dropped it into his waistcoat pocket, picked up his French fowling piece, and pushed himself up from the bench. His foot throbbed with a dull, rhythmic pulse that matched the ticking of the tall clock in the corner of the taproom.

"Lead on, Mr. Bushnell," Ezra said, adjusting his pack straps over his sore shoulders. "Let's go look at your snapping turtle."

They walked out into the road, leaving the shouting militia and the smell of roasting pork behind. The afternoon sun had broken through the gray salt haze, casting long, pale shadows across the mud of the Saybrook turnpike. Down below the town, where the Connecticut River broadened out into the great, gray expanse of the sound, a pair of gulls were hanging stationary in the wind, their wings curved like white scythes against the empty sky.

Bushnell walked fast, his head down, his hands plunged deep into the pockets of his dark coat, his shoes slapping into the ruts without regard for the mud. He did not look like a soldier; he looked like an apothecary who had forgotten his basket, or a schoolmaster late for his grammar class.

"The air in the hull," Bushnell said without turning around, his voice carried back on the salty breeze, "tastes of oakum and tallow. It is not sweet. Some men feel a dizziness behind the eyes after twenty minutes. You must not fight the dizziness, Sergeant. If you fight it, your heart beats twice as fast, and you drink down the good air like small beer at a mowing-bee. You must let your breath go out slow. Like a cow chewing her cud in the shade. Slow and even."

"I have spent twenty years behind oxen, sir," Ezra said, limping along three paces behind him. "I know how to be slow. It’s the only thing the Almighty gave a Connecticut man that the King couldn't tax."

Bushnell made a small noise in his throat that might have been assent, or might simply have been the sound of an inventor calculating the cubic inches of an ox’s lungs. They turned off the main road onto a cart-path that led down through the scrub oaks toward the marshy margins of the river, where the smell of salt mud grew stronger with every step, and the world began to look less like a country of men and more like an edge of the sea that had not yet decided what it wanted to be.

Behind them, the church bell in Saybrook began to ring, tolling for some town meeting or another, its iron voice rising and falling in the gusty spring wind. Ezra listened to it until the sound was swallowed by the hiss of the salt grass and the steady, heavy lap of the cold water against the muddy bank.