The Henry Knox Trail marker at Cohoes recalls one of the Revolution's most remarkable logistical operations: the winter movement of artillery from Fort Ticonderoga to the American army outside Boston. In November 1775, twenty-five-year-old bookseller and militia officer Henry Knox proposed using captured cannon from Lake Champlain to break the siege. George Washington approved the plan, and Knox traveled north to select and transport the weapons.

Knox assembled nearly sixty cannon, mortars, and howitzers, together weighing about sixty tons. Crews moved them by boat, sled, ox team, and horse over roughly three hundred miles of water, forest roads, steep grades, and frozen countryside. Weather alternately helped and hindered the expedition: snow made sledding possible, but thin ice, thawing roads, and broken equipment caused repeated delays. Local teamsters, laborers, innkeepers, and animals made the feat possible.

The route followed Lake George and the Hudson corridor toward Albany before turning east through the Berkshires and across Massachusetts. Passing the Cohoes area placed the train near the Hudson and Mohawk transportation junction that had long connected northern New York with New England. The roadside marker represents a corridor rather than proof that every gun passed the exact modern point. Knox's own journal and later route research document a journey whose precise details sometimes vary among commemorations.

By late January 1776 the artillery reached Cambridge. Washington's army spent the next several weeks preparing platforms, ammunition, and a plan to occupy Dorchester Heights. On the night of March 4–5, Continental troops fortified the heights and positioned heavy guns overlooking Boston and its harbor. The British could not safely remain without dislodging them. After plans for an assault were frustrated, British forces evacuated Boston on March 17.

Knox's accomplishment brought him promotion and established his reputation as the Continental Army's chief artillery officer. The episode demonstrates that military success depended on transportation and organization as much as battlefield courage. Artillery was useful only if people could inventory it, move it, repair roads and sleds, feed teams, and deliver powder and shot. Communities along the route became temporary participants in a campaign unfolding far beyond their towns.

The marker turns an ordinary stretch of road into part of a continental supply line. It links the capture of Fort Ticonderoga in 1775 with the first major American strategic success of 1776 and shows how geography connected separate theaters of war. Remembering the noble train of artillery also highlights the often-unseen work of civilian contractors and laborers. Their winter effort converted distant captured weapons into leverage that compelled a powerful occupying army to leave Boston.