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1750–1806

Henry Knox

Continental Army OfficerChief of Artillery

Biography

Henry Knox was born on July 25, 1750, in Boston, Massachusetts. His father abandoned the family when Henry was young, and he left school at age twelve to work in a bookshop to support his mother. He eventually opened his own bookstore, the London Book-Store, on Cornhill Street in Boston, where he developed an extensive knowledge of military science by reading the European treatises on artillery, fortification, and engineering that he sold. This self-education would prove decisive for the Revolution: Knox became one of the Continental Army's foremost experts on artillery despite having no formal military training.

Knox came to Washington's attention during the Siege of Boston in 1775, when he proposed an audacious plan to transport captured British cannons from Fort Ticonderoga in upstate New York to the heights around Boston — a distance of roughly 300 miles through the winter wilderness. Washington approved the plan, and Knox executed it between November 1775 and January 1776, moving approximately 60 tons of artillery by ox-drawn sledges over frozen lakes and through the Berkshire Mountains. The cannons, emplaced on Dorchester Heights, forced the British evacuation of Boston in March 1776.

During the Trenton campaign, Knox was responsible for the artillery that proved decisive in the battle. He supervised the transport of eighteen cannons across the Delaware River on the night of December 25-26, 1776, and then positioned them to command the streets of Trenton. The American artillery fired grapeshot and canister down King and Queen Streets, preventing the Hessians from forming organized defensive lines. Knox's guns turned a surprise attack into a decisive victory. He continued to serve as Washington's chief of artillery throughout the war and was later appointed the first Secretary of War under the Constitution.

WHY HE MATTERS TO TRENTON

Henry Knox's artillery was the decisive weapon at the Battle of Trenton. The eighteen cannons he transported across the Delaware and positioned at the heads of Trenton's main streets made it impossible for the Hessians to mount an effective counterattack. His men fired continuously during the battle, raking the streets with grapeshot while American infantry closed in from multiple directions. Knox demonstrated that artillery could be used not just in sieges but as a mobile weapon in offensive operations — a lesson he had taught himself from books in a Boston bookshop.

  • 1750: Born July 25 in Boston, Massachusetts
  • 1775-1776: Transported cannons from Fort Ticonderoga to Boston
  • 1776 (December 25-26): Supervised artillery transport across the Delaware River
  • 1776 (December 26): Commanded artillery at the Battle of Trenton
  • 1806: Died October 25 in Thomaston, Maine

SOURCES

  • Puls, Mark. "Henry Knox: Visionary General of the American Revolution." Palgrave Macmillan, 2008.
  • Fischer, David Hackett. "Washington's Crossing." Oxford University Press, 2004.
  • Brooks, Noah. "Henry Knox: A Soldier of the Revolution." G.P. Putnam's Sons, 1900.

In Trenton

  1. Dec

    1776

    Washington Crosses the Delaware

    Role: Supervised the transport of 18 artillery pieces across the river

    # Washington Crosses the Delaware By the final weeks of December 1776, the American cause for independence stood on the edge of collapse. What had begun with soaring optimism in July, when the Continental Congress declared independence from Great Britain, had devolved into a desperate fight for survival. After a series of devastating defeats in New York — at Long Island, Manhattan, and Fort Washington — General George Washington's Continental Army had been driven across New Jersey in a harrowing retreat. The British and their Hessian allies pursued the Americans relentlessly, and morale within the ranks plummeted. Enlistments for thousands of soldiers were set to expire on December 31, and many showed no inclination to reenlist. The army that had once promised to birth a new nation was melting away. Thomas Paine, marching with the retreating troops, captured the desperation of the hour in his famous pamphlet, writing, "These are the times that try men's souls." It was in this atmosphere of near-total despair that Washington conceived a bold and dangerous plan to strike the Hessian garrison stationed at Trenton, New Jersey. On the evening of December 25, 1776 — Christmas night — Washington led approximately 2,400 troops to the banks of the ice-choked Delaware River at McConkey's Ferry, about nine miles north of Trenton. The plan called for a nighttime crossing from Pennsylvania into New Jersey, followed by a swift march south to attack the Hessian soldiers at dawn, when they would be least prepared. The operation depended on coordination, secrecy, and sheer physical endurance in some of the worst weather imaginable. A nor'easter descended on the region that evening, lashing the soldiers with sleet, freezing rain, and bitter winds. The river itself was clogged with massive chunks of ice, making the crossing treacherous in the extreme. The man entrusted with managing the boats was Colonel John Glover, who commanded a regiment of seasoned mariners from Marblehead, Massachusetts. These fishermen and sailors were uniquely suited to the task, and they manned the large, flat-bottomed Durham boats that ferried soldiers, horses, and heavy weaponry across the swollen river. Colonel Henry Knox, Washington's trusted chief of artillery, supervised the transport of eighteen cannon — a logistical feat of extraordinary difficulty given the conditions. Moving those heavy guns across a frozen, churning river in darkness and storm required immense skill and determination, but Knox and his men succeeded. The original plan had called for three separate crossings at different points along the river. General John Cadwalader commanded the southern column and was tasked with crossing downstream to create a diversion, but the ice proved impassable for his force. A militia column under Colonel Ewing also failed to complete its crossing. Washington's was the only column that made it to the far shore. The crossing ran far behind schedule. Washington had hoped to have his entire force across by midnight, but the last troops did not reach the New Jersey side until approximately 3:00 AM. The element of a predawn surprise attack was slipping away. Nevertheless, Washington pressed forward, ordering his men to begin the nine-mile march to Trenton through the darkness and freezing rain. The soldiers, many of whom lacked proper boots and left bloody footprints in the snow, marched in two columns that converged on Trenton from different directions. When they struck the Hessian garrison in the early morning hours of December 26, the attack achieved devastating surprise. The battle lasted roughly ninety minutes. Nearly a thousand Hessian soldiers were killed, wounded, or captured, while American casualties were remarkably light. The victory at Trenton was modest in purely military terms, but its psychological and strategic impact was immense. It shattered the myth of Hessian invincibility, reinvigorated recruitment, and proved that the Continental Army could execute a complex offensive operation against professional soldiers. Coming at the darkest moment of the Revolution, the crossing and the battle that followed restored faith in the cause of independence and in Washington's leadership. Coupled with a subsequent victory at Princeton just days later, the Trenton campaign turned the tide of the war during its most critical period. The logistical achievement of moving an entire army with artillery across a frozen river in a winter storm at night remains one of the most remarkable feats in American military history, and it stands as an enduring symbol of perseverance against seemingly impossible odds.

  2. Dec

    1776

    Battle of Trenton

    Role: Chief of Artillery; commanded the guns that dominated Trenton's streets

    # The Battle of Trenton By the winter of 1776, the American cause seemed on the verge of collapse. What had begun with bold declarations of independence in July had devolved into a series of devastating military defeats. General George Washington's Continental Army had been driven from New York City after disastrous engagements at Long Island and Manhattan, then chased across New Jersey by a confident British force. Enlistments were expiring at the end of December, and thousands of soldiers were preparing to simply walk away from the war. Morale had cratered. Thomas Paine captured the desperation of the moment when he wrote, "These are the times that try men's souls." Against this bleak backdrop, Washington understood that without a dramatic stroke — something to revive the spirit of the revolution — the war for American independence might end not with a climactic battle but with a quiet, inglorious disintegration. Washington settled on a daring plan: a surprise attack on the Hessian garrison stationed at Trenton, New Jersey. The Hessians were German professional soldiers hired by the British Crown, and roughly 1,400 of them occupied the town under the command of Colonel Johann Rall, a veteran officer who, by most accounts, underestimated the fighting capacity of the ragged Continental forces across the river. Washington's plan called for a nighttime crossing of the ice-choked Delaware River on Christmas night, followed by a rapid march to strike Trenton at dawn before the garrison could mount an organized defense. The crossing itself was an extraordinary feat of determination. On the evening of December 25, approximately 2,400 soldiers, along with horses and eighteen pieces of artillery, embarked in Durham boats through a blinding storm of sleet and snow. Henry Knox, Washington's chief of artillery and a man of imposing physical presence and booming voice, supervised the dangerous effort of ferrying heavy cannons across the river's treacherous current. The operation fell behind schedule — the army did not complete the crossing until well after midnight — but Washington pressed forward regardless, dividing his force into two columns for a converging assault on Trenton. The attack began at approximately eight o'clock on the morning of December 26. General Nathanael Greene's column advanced from the north along the Pennington Road while General John Sullivan's column approached from the west along the River Road. The Hessians, caught off guard, scrambled to organize a defense. Colonel Rall attempted to rally his men and form battle lines on King and Queen Streets, the town's two main thoroughfares, but Continental artillery made this impossible. Knox's guns, positioned to command the streets, poured devastating fire into the Hessian ranks. Among the artillery officers who played a critical role was a young captain named Alexander Hamilton, who positioned his cannons at the junction of King and Queen Streets, turning the intersection into a killing ground that shattered every attempt at organized resistance. Meanwhile, Lieutenant James Monroe — a future president of the United States, though no one could have known it then — led a charge to capture Hessian artillery on King Street and was seriously wounded in the shoulder during the action. The battle lasted roughly ninety minutes. Rall, leading a desperate counterattack on horseback, was struck by musket fire and mortally wounded; he would die of his injuries later that day. With their commander fallen and Continental forces closing in from multiple directions, the Hessian resistance collapsed. Approximately 900 Hessian soldiers were captured, 22 were killed, and 83 were wounded. American casualties were remarkably light — two soldiers froze to death during the overnight crossing, and five were wounded in the fighting itself, Monroe among them. The significance of the Battle of Trenton far exceeded what the raw numbers might suggest. It was the first major offensive victory for the Continental Army, and it arrived at precisely the moment when the revolution needed it most. The triumph electrified the American public, reinvigorated recruitment, and convinced wavering soldiers to reenlist rather than abandon the cause. It demonstrated that Washington was capable of bold, imaginative generalship and that the Continental Army could defeat professional European troops in open combat. Within days, Washington would follow up with another victory at Princeton, further solidifying the turnaround. Together, these engagements transformed the strategic picture of the war, turning a season of despair into one of renewed hope and ensuring that the fight for independence would continue.

  3. Jan

    1777

    Second Battle of Trenton (Battle of the Assunpink Creek)

    Role: Commanded artillery defending the creek bridge

    **The Second Battle of Trenton (Battle of the Assunpink Creek)** By early January 1777, the American Revolution hung in a precarious balance. The Continental Army had spent much of the previous year in retreat, driven from New York and across New Jersey by a confident and seemingly unstoppable British force. Enlistments were expiring, morale was crumbling, and many observers on both sides of the Atlantic believed the rebellion was nearing its end. Then, on the morning of December 26, 1776, George Washington led his famous crossing of the Delaware River and struck the Hessian garrison at Trenton, capturing nearly a thousand soldiers in a swift and stunning victory. That triumph, however, was only the beginning of a remarkable week that would reshape the war. What followed just days later — a defensive stand along the Assunpink Creek and a daring nighttime escape — would prove equally significant, even if it is far less remembered. After the first battle, Washington initially withdrew his forces back across the Delaware into Pennsylvania. But recognizing the strategic and psychological importance of holding New Jersey, he soon returned to Trenton with a reinforced army that included fresh militia units. Among those reinforcements were the Philadelphia militiamen commanded by John Cadwalader, a respected civic leader and officer whose troops added vital manpower to the Continental force. Washington positioned his army along the south bank of the Assunpink Creek, a natural defensive barrier that cut through the town. The creek, though not especially wide, featured steep and muddy banks that made crossing difficult, and a single stone bridge that served as the most obvious point of passage. Washington entrusted the defense of this critical chokepoint to Henry Knox, the self-taught artillerist who had already distinguished himself throughout the campaign. Knox arrayed his cannons to command the bridge and the approaches to it, creating a deadly field of fire that any attacker would have to endure. On the afternoon of January 2, 1777, British General Charles Cornwallis arrived at Trenton with approximately 5,500 troops, having marched south from Princeton with the intention of crushing Washington's army once and for all. Cornwallis launched three determined assaults across the bridge and at various fording points along the creek. Each time, the Continental defenders — supported by Knox's well-placed artillery and the steady musket fire of soldiers and militia alike — repulsed the British attacks with significant losses. As darkness fell and the fighting subsided, Cornwallis reportedly expressed confidence that he had Washington trapped, allegedly declaring that he would bag the "old fox" in the morning. He chose to rest his weary troops and finish the engagement at daylight. But Washington had no intention of waiting. In one of the most audacious maneuvers of the entire war, he ordered his army to slip away under cover of darkness, leaving campfires burning brightly along the creek to deceive British sentries into believing the American force remained in place. Soldiers muffled the wheels of their artillery with rags and crept quietly along back roads, marching not in retreat but around Cornwallis's left flank toward Princeton, where a smaller British garrison lay vulnerable. By morning, Cornwallis awoke to find his quarry gone and the distant sound of cannon fire rolling in from the north, where Washington was already engaging British troops at the Battle of Princeton. The Second Battle of Trenton matters for several reasons that extend well beyond the immediate tactical outcome. It demonstrated convincingly that the Continental Army could hold a fortified defensive position against a larger, professional British force — something many doubters on both sides had considered unlikely. The disciplined performance of regulars and militia together, coordinated under Washington's leadership and Knox's skilled gunnery, showed a growing maturity in the American military effort. Perhaps more importantly, the overnight march revealed a level of strategic cunning and operational boldness that British commanders consistently underestimated. Washington proved that he could not only fight but also think several moves ahead, turning what appeared to be a trapped position into a springboard for further offensive action. Together, the twin battles at Trenton and the subsequent victory at Princeton revitalized the American cause at its lowest moment. They persuaded wavering soldiers to reenlist, encouraged new volunteers to join the fight, and convinced foreign observers — particularly in France — that the Continental Army was a force worthy of support. The "old fox" had proven far more dangerous than Cornwallis imagined, and the war would continue with renewed American determination.

  4. Jan

    1777

    Night March from Trenton to Princeton

    Role: Supervised the movement of artillery with muffled wheels

    **The Night March from Trenton to Princeton: A Masterpiece of Revolutionary Deception** By the closing days of 1776, the American cause teetered on the edge of collapse. The Continental Army had suffered a devastating string of defeats in New York, losing Long Island, Manhattan, and Fort Washington in rapid succession. Pursued across New Jersey by a confident British force, George Washington's army had dwindled from disease, desertion, and expiring enlistments to a shadow of its former strength. Morale was at its nadir, and many observers on both sides of the Atlantic believed the rebellion was all but finished. It was in this desperate context that Washington launched the famous crossing of the Delaware River on Christmas night, 1776, striking the Hessian garrison at Trenton the following morning and capturing nearly a thousand prisoners. That victory electrified the nation, but it did not end the danger. Within days, British General Charles Cornwallis was marching south from New Brunswick with a substantial force, determined to pin Washington against the Delaware River and crush the rebellion once and for all. On January 2, 1777, Cornwallis's advancing troops clashed with American forces south of Trenton, pushing them back through the town to the far side of Assunpink Creek. By evening, Washington's army was encamped along the creek's southern bank, and Cornwallis, confident that the Americans were trapped, reportedly told his officers that he would "bag the fox in the morning." The situation appeared grim for the Continental Army. A direct engagement with Cornwallis's superior force would almost certainly result in a catastrophic defeat, and retreat across the Delaware in the face of the enemy was nearly impossible. Washington, however, had no intention of waiting for morning. In one of the most audacious decisions of the entire war, Washington conceived and directed a plan to abandon his position under the cover of darkness and march his army around the British left flank to strike the garrison at Princeton. The deception was elaborate and deliberate. Campfires were left burning brightly along the Assunpink to convince British sentries that the American army remained in place. Small detachments stayed behind to feed the flames and make enough noise to sustain the illusion. Meanwhile, Henry Knox, Washington's trusted chief of artillery, supervised the painstaking movement of the army's cannons, ordering the wheels wrapped in heavy rags to muffle the telltale sound of iron rolling over frozen ground. The march itself was a brutal test of endurance and discipline. The army moved east along the Quaker Bridge Road and then turned north toward Princeton, covering approximately twelve miles through the long winter night. Conditions were punishing. A thaw during the previous day had turned the roads to deep mud, but as temperatures plunged after nightfall, the surface refroze into an uneven, rutted terrain that punished men and horses alike. Soldiers marched in near-total silence, knowing that any stray sound or flicker of unauthorized light could alert British pickets across the creek and doom the entire enterprise. The discipline required was extraordinary, particularly from troops who were exhausted, hungry, and insufficiently clothed for the bitter cold. By dawn on January 3, 1777, Washington's army had reached the outskirts of Princeton. In the sharp engagement that followed, the Americans routed the British defenders, though not without hard fighting and significant casualties on both sides. The strategic consequences were immediate and profound. By seizing Princeton, Washington placed his army squarely across Cornwallis's supply and communication line stretching back to New Brunswick. Cornwallis, who had awoken that morning expecting to destroy the Continental Army at Trenton, was instead forced to abandon his offensive and rush north to protect his stores. In the days that followed, the British pulled back from most of their outposts across central and western New Jersey, conceding territory they had seized during the autumn campaign. The night march from Trenton to Princeton stands as one of the defining episodes of the American Revolution. It was the culminating act of what historians call the "Ten Crucial Days," the period between Washington's crossing of the Delaware on December 25, 1776, and the victory at Princeton on January 3, 1777. In that span, Washington transformed the strategic landscape of the war, reviving American morale, encouraging new enlistments, and demonstrating to both allies and enemies that the Continental Army was a force capable of initiative, cunning, and resilience. The march itself, executed in freezing darkness against seemingly impossible odds, revealed Washington's genius not merely as a battlefield commander but as a leader who understood the power of deception, timing, and sheer audacity to overcome material disadvantage. It remains one of the finest examples of strategic maneuver in American military history.