British Place Guns on Mount Defiance

**The Guns on Mount Defiance: The Fall of Fort Ticonderoga, 1777**

Fort Ticonderoga had loomed large in the American imagination since the earliest days of the Revolution. In May 1775, Ethan Allen and Benedict Arnold had seized the fort from a small British garrison in a bold surprise attack that gave the fledgling Continental cause one of its first victories and, critically, a cache of artillery that Henry Knox would later drag across the wilderness to help break the British siege of Boston. For two years after that capture, Ticonderoga stood as a symbol of American defiance and a strategic linchpin controlling the waterway corridor between Canada and the Hudson River Valley. The Americans fortified it, garrisoned it, and assumed it would hold. That assumption proved dangerously wrong in the summer of 1777.

The British campaign that brought artillery to the summit of Mount Defiance was part of a larger strategic design. General John Burgoyne, commanding a substantial British and allied force, had launched an invasion southward from Canada with the goal of severing New England from the rest of the colonies by seizing control of the Hudson River corridor. Ticonderoga was the first major obstacle in his path. Burgoyne's force, numbering roughly eight thousand regulars, German auxiliaries, Loyalists, and Native American allies, advanced down Lake Champlain in late June 1777, arriving before the fort in early July. The American garrison, commanded by Major General Arthur St. Clair, was woefully undermanned. St. Clair had perhaps three thousand troops, many of them poorly equipped and insufficiently supplied, to defend an extensive network of fortifications that included not only the old stone fort on the western shore but also the works on Mount Independence across the lake to the east, connected by a fortified bridge and boom.

The fatal vulnerability lay to the south, where Mount Defiance — also known as Sugar Loaf Hill — rose 853 feet above the surrounding terrain. American officers had debated for months whether the steep, wooded height was accessible to artillery. Some dismissed it as too rugged to pose a threat. General Anthony Wayne, who had served at Ticonderoga earlier, had argued forcefully that the summit should be fortified precisely because it commanded both the fort and the bridge to Mount Independence. His warnings went unheeded. The Americans lacked the manpower and resources to extend their defensive perimeter to yet another position, and a lingering confidence in the hill's natural inaccessibility led commanders to gamble that it would not be exploited.

British engineers, led by Lieutenant William Twiss, surveyed the hill and determined that a road could indeed be cut to the top. Working with remarkable speed, soldiers and laborers hauled twelve-pound cannon up the slope and emplaced them on the summit. When the morning of July 5 revealed British guns looking down on every critical point of the American position, the strategic calculus changed in an instant. Artillery on Mount Defiance could rain fire onto the fort, the bridge, and the Mount Independence works. There was no adequate counter to such a commanding height.

Major General St. Clair faced an agonizing decision, but the mathematics of the situation left little room for debate. Holding the fort would mean subjecting his outnumbered garrison to a devastating bombardment followed by an assault they could not withstand. He ordered an evacuation under cover of darkness on the night of July 5–6. The withdrawal was hasty and chaotic. British forces pursued the retreating Americans, catching and mauling the rear guard at the Battle of Hubbardton on July 7 and scattering supplies and troops along the retreat route.

The loss of Ticonderoga sent shockwaves through the young nation. The public was outraged, and St. Clair faced a court-martial, though he was eventually acquitted of wrongdoing. Yet the broader consequences of Burgoyne's advance were not what the British had anticipated. The fall of Ticonderoga and the subsequent British push southward galvanized American resistance rather than crushing it. Militia turned out in force across New England and New York, and Burgoyne's increasingly overextended army met defeat at the Battles of Saratoga that October — a turning point that brought France into the war as an American ally.

The episode at Mount Defiance endures as a cautionary lesson in military planning. A known vulnerability, debated but left unaddressed due to insufficient resources and wishful thinking, was exploited by an adversary willing to do the hard work of turning possibility into reality. The guns that British engineers wrestled to that summit did not merely end a siege; they altered the course of a campaign and, ultimately, helped reshape the trajectory of the entire war.