Key figures: Henry Knox, George Washington, William Howe, Rufus Putnam, John Thomas, Nathanael Greene
Summary
Henry Knox (1750–1806), born in Boston to a merchant family, was self-taught in military science and mathematics. In 1775–1776, he transformed himself from a Boston bookseller into the Continental Army’s chief artillerist, a role he would hold throughout the war and beyond. His crucial 1776 contribution was two-fold: he led the winter 1775–1776 “noble train of artillery” expedition that transported captured cannon from Fort Ticonderoga to Boston, then applied those guns to fortify Dorchester Heights overnight on March 4–5, 1776 — a maneuver that threatened the British position so dramatically that General William Howe ordered the evacuation of Boston on March 17. This single campaign, accomplished without a pitched battle, earned Knox the gratitude of Washington and the Continental Congress, cemented his reputation as an innovator, and established the tactical pattern of using fortified heights and artillery to dictate field positions — a strategy that would recur throughout the Revolutionary War.
Early Life and the Path to Ticonderoga
Knox was born December 25, 1750, in Boston into a declining merchant family. He received a modest education and in his teens opened the London Book-Store in Cornhill, where he taught himself military science, engineering, and mathematics through voracious reading. Among the works Knox absorbed were Maurice de Saxe’s Mes Rêveries (1757) and Benjamin Robins’s New Principles of Gunnery (1742) — treatises on field artillery and projectile ballistics that most British officers of the era had not read carefully. By 1775, he had become known to Samuel Adams and other patriot leaders as both a theorist and an eager volunteer. When the Continental Army was formed under George Washington in June 1775, Knox sought a commission and was appointed chief of the artillery regiment in the Massachusetts forces under the Continental Congress — a position without artillery to command, since the army possessed only a handful of old cannon.
The solution lay 150 miles north: Fort Ticonderoga, captured by Ethan Allen and Benedict Arnold in May 1775, held an arsenal of captured British ordnance — upwards of 59 cannon, 10 mortars, and 3 cohorns — that the Continental Army desperately needed. The guns’ combined weight exceeded 60 tons. In late December 1775, Washington authorized Knox to organize an expedition to retrieve them. Knox accepted enthusiastically; at 25, he was about to undertake one of the war’s most audacious logistics operations.
The Expedition and the “Noble Train of Artillery”
Knox departed Cambridge on November 16, 1775, arriving at Ticonderoga by December 5. The expedition proceeded across snow-covered terrain via a convoluted route — south along Lake George by bateaux to its southern tip, then overland and across the frozen Hudson River, down through Albany, across the Berkshire Hills of western Massachusetts, then northeast into Cambridge. The journey of approximately 300 miles took some fifty-six days of grueling winter travel from Ticonderoga to Cambridge.
Knox organized the transport with remarkable precision. He commissioned the construction of 42 sleds — heavy flat-decked timber platforms capable of bearing cannon weighing from 600 pounds (3-pounders) to several tons (18-pounders) — and assembled teams of oxen and horses to draw them. The Hudson River crossing at Glens Falls required particular ingenuity: Knox waited for the ice to thicken, then moved the heaviest pieces across at night in small groups to distribute the load. One 18-pounder broke through the ice near Half Moon (present-day Mechanicville, NY), but was recovered intact. Total weight transported: approximately 119,000 pounds of iron and bronze ordnance.
The first guns arrived in Cambridge in late January 1776; the Boston Gazette of January 25 noted the train passing through Framingham, Massachusetts. By early March, the full complement had reached Boston. John Adams later dubbed the operation the “noble train of artillery” — a phrase that stuck in Revolutionary memory as one of the war’s most elegant logistics triumphs. Washington’s February 26 letter to Congress described Knox’s achievement as having been executed “with great industry and no little danger.”
The Fortification of Dorchester Heights
With Boston occupied by General William Howe (see General William Howe in 1776) and the Continental Army encamped outside, the strategic situation had become stalemate. Howe controlled the city but faced the risk of siege if Washington gained high ground overlooking the harbor. In February 1776, Washington’s engineers, led by Rufus Putnam, had designed prefabricated fortification frames (wooden chandeliers holding fascines, gabions, and compressed hay bales) that could be assembled without audible digging — critical since frozen ground would ring out under picks. Knox, working with Putnam and General John Thomas (commander of the Boston forces), identified Dorchester Heights as the decisive position. Its twin summits rose roughly 120 feet above sea level, giving the Continental Army direct line-of-sight over Howe’s naval anchorage at Long Wharf and the occupied city. (Nook’s Hill, a lower point closer to Boston, was fortified only later, around March 9.)
On the night of March 4–5, 1776, under cover of darkness and a diversionary cannonade from Lechmere Point (directed by Knox’s artillery crews), approximately 2,000 troops moved onto Dorchester Heights with the prefabricated works and 59 cannon. The column included some 800 oxen drawing 360 cartloads of equipment. Working through the night, the men assembled the defensive works and positioned the guns — including 18-pounders capable of engaging ships in the harbor — by dawn. On the morning of March 5, British observers aboard ships in the harbor reported seeing a fully fortified position that appeared, as Howe reportedly said, to have been “raised by the genii.” It was the anniversary of the Boston Massacre; the symbolic timing was deliberate.
Howe immediately ordered a counterattack, assembling roughly 2,400 regulars under Lord Percy for an amphibious assault on the heights’ southeastern base near Dorchester Neck. The troops were loaded into boats at Castle William on March 5, but a violent gale rising that night prevented the crossing. By March 6, the weather cleared, but the tactical moment had passed: the fortifications had been strengthened further, and Howe concluded that the cost of an assault would exceed any strategic benefit. On March 17, 1776 — St. Patrick’s Day — Howe evacuated Boston, embarking approximately 9,000 troops and 1,000 Loyalist civilians aboard 120 ships, sailing for Halifax. (See Fortification of Dorchester Heights for the full operational account.)
Knox had been commissioned Colonel of the Continental Regiment of Artillery on November 17, 1775; his distinguished service through 1776 — culminating at Trenton — earned him promotion to Brigadier General by resolution of the Continental Congress on December 27, 1776.
Knox’s Relationship with Washington
Washington and Knox formed one of the most productive officer partnerships of the war. Washington, a Virginia planter accustomed to militia organization and cavalry thinking, recognized in Knox the technical expertise he himself lacked: ballistics, projectile fuzes, proper emplacement of siege batteries. After Dorchester Heights, Washington consistently stationed Knox at his right hand during councils of war. Nathanael Greene, Knox’s fellow officer and eventual Southern theater commander, described Knox in 1776 as “a genius at the business of ordnance” whose logistical capacity exceeded that of any European-trained officer then serving the Continental cause.
Washington’s letters to Congress repeatedly cite Knox by name when recommending artillery resources, an unusual distinction at a time when most commanders’ requests named units rather than individuals. By year’s end, Knox had become one of Washington’s inner circle — alongside Greene, Alexander Hamilton (who joined as aide-de-camp in March 1777), and Charles Lee (before his capture and subsequent disgrace).
Later 1776 Service
Following the evacuation of Boston, Knox accompanied the army to New York, where he supervised artillery positions through a punishing succession of engagements. At the Battle of Long Island (August 27), Knox directed the artillery screen covering the American retreat across the East River on the night of August 29–30 — a crossing of 9,500 men, cannon, horses, and supplies that Knox coordinated without the loss of a single gun. At Kip’s Bay (September 15), British naval fire overwhelmed Knox’s beach positions; at Harlem Heights (September 16), Knox’s hilltop artillery helped repulse a British probe — one of the first American field successes in New York. At White Plains (October 28) and the fall of Fort Washington (November 16), he was present throughout the cascading defeats of the autumn campaign.
The 1776 New York campaign’s failures were strategic and numerical — British strength in men and ships vastly exceeded what Knox’s artillery could compensate for — but Knox’s professional conduct under pressure distinguished him among the army’s surviving senior officers. His most celebrated single action of late 1776 came at the Battle of Trenton (December 26), where 18 artillery pieces under his direction crossed the icy Delaware River and opened the attack on the Hessian garrison. Knox coordinated the river crossing — 2,400 men, 18 cannon, and horses in three hours of darkness and sleet — and directed the guns that cut off the Hessian escape routes during the engagement itself. Washington’s report to Congress singled out “Colonel Knox and the officers of the artillery” as having performed with “great activity and conduct.”
Self-Education as Military Model
Knox’s career in 1776 presented a distinctive model that the Continental Army would develop throughout the war: the officer-scholar who translates reading into practice without formal military schooling. At the London Book-Store he had stocked, and read, works unavailable in most colonial libraries — European treatises on fortification, siege engineering, and artillery tactics that gave him a theoretical grounding few British officers of his rank possessed. His 1776 success demonstrated that the Continental Army’s chronic disadvantages in numbers, training, and equipment could be partially offset by intelligent command — a lesson Washington internalized and applied consistently.
Knox’s self-education also left him with broader intellectual habits: he could calculate trajectories, plan logistics routes, and draft field dispatches with equal facility. These skills would prove invaluable in his post-war role as the first U.S. Secretary of War (1789–1794), when he designed the foundational institutions of the American military — including the system of national arsenals modeled explicitly on what he had learned at Ticonderoga and Dorchester Heights.
Significance
Knox’s 1776 marked his emergence as the indispensable officer who bridged Washington’s strategic vision and the Continental Army’s material capacity. His success at Ticonderoga–Dorchester Heights demonstrated that an army of militia and volunteers, led by intelligent officer-engineers, could match and outmaneuver the British regulars. His self-education — from Boston bookseller to chief of artillery in one year — exemplified the meritocratic improvisation the Revolution demanded.
The “noble train” expedition and the Dorchester Heights fortification became touchstones of revolutionary enterprise: improvised, audacious, and triumphant. They established Knox’s reputation as the officer most capable of translating Washington’s conception into action — a standing that would lead to his appointment as Secretary of War in 1789 and his recognition as the architect of the early Republic’s military institutions.
Sources
- Callahan, North. Henry Knox: A Soldier of the Revolution (Rinehart, 1958). Authoritative biography covering the Ticonderoga expedition and Dorchester Heights in detail; documents the 42-sled train and the 56-day transit time.
- Wikipedia. “Henry Knox” and “Dorchester Heights” — encyclopedic accounts of Knox’s service and the February–March 1776 Boston campaign, including specific ordnance counts.
- Drake, Francis S. (ed.). Life and Correspondence of Henry Knox (G.P. Putnam’s Sons, 1873). Primary letters and documents from Knox’s Revolutionary service, including Washington’s February 26 letter to Congress.
- Lengel, Edward G. General George Washington: A Military Life (Random House, 2005). Contextualizes Knox’s role within Washington’s overall strategy during 1776, including the December 27 promotion to brigadier general.
- National Park Service. Boston National Historical Park and Dorchester Heights NHS interpretive materials documenting the 1776 fortification and evacuation, including ordnance weights and troop counts.