The Battle of Ticonderoga occurred on July 5 and July 6, 1777 in New York. It was more a battle of maneuver than a direct conflict in the American Revolutionary War. The British Army, led by John Burgoyne, occupied the fort after forcing American General Arthur St. Clair to withdraw the defenders.
The British and colonists advance of the previous summer was halted at the Battle of Valcour. Fort Ticonderoga was a key stronghold in controlling the southern extent of Lake Champlain and thus entry to the Hudson River Valley. The British strategy was to divide the rebellious colonies in two by linking British forces moving south from Quebec with those moving northward along the Hudson from New York City. The taking of the fort was key to the success of this strategy.
Since the winter, American forces had worked for months in defensive preparations to repair the old fort, and they had built several new battlements. They also strengthened Fort Independence across Lake Champlain and had constructed a pontoon bridge where the La Chute River entered to support communication between the two forts.
A height called Sugar Loaf overlooked both forts, and large cannon on that height would make their positions impossible to defend; a tactical problem that John Trumbull had pointed out earlier in the year when General Gates had been in command.
With Gates and Schuyler locked in a political struggle for command of the Northern Department, and General St. Clair left in command, he refused to override Schuyler's orders, holding to his position even after Tadeusz Kościuszko repeated Trumbull's warning and Benedict Arnold, with his bad leg, climbed to the top of Sugar Loaf to confirm the reality of the threat. Since Gates now endorsed Kosciuszko's advice, Schuyler and St. Clair ignored it.
Burgoyne's force of around 8,000 men with artillery and naval support was enough to overwhelm St. Clair's position, manned by about 3,500 newly-arrived militia. Schuyler ordered St. Clair to hold out as long as he could before withdrawing, while additional forces were gathered for the defense of Albany. By early July, the Burgoyne expedition arrived in the area.
British reconnaissance also discovered the strategic position of Sugar Loaf. Starting on July 2, they cleared and fortified gun emplacements on top of that height. They also spent several days drawing some of their larger guns up the slope, using winches to move from tree to tree. On July 4, the Americans held a quiet celebration with some toasts to commemorate the previous year's Declaration of Independence, but on the morning of July 5, 1777, they awoke to discover the completed British position, with more guns arriving throughout the day.
Trumbull had already demonstrated that fire from the American guns could not reach the summit. The British guns opened fire on the fort, and after a council of war it was decided that the army would retreat from the fort. St Clair withdrew his troops in July 5th.
The guns at Ticonderoga, most remaining supplies, and some men too ill and wounded to move were left to the British. A handful of men were left at Fort Independence with loaded cannon and lit matches to fire on the pontoon bridge after the withdrawal, but they were incapable of mounting a defense. The next morning, British troops captured them and occupied the forts without firing a shot. General Simon Fraser set out in pursuit of the retreating Americans.
The withdrawal from Ticonderoga was hurried but was a part of the American defensive strategy adopted by General Schuyler in response to the British Saratoga Campaign. Fraser's pursuit resulted in the Battle of Hubbardton when they caught up with the rear guard. St. Clair, meanwhile, brought most of his men to join forces with Schuyler at Fort Edward and to prepare for the Battle of Saratoga. Ticonderoga did not substantially delay Burgoyne's advance, but he did leave several regiments and much of his Canadian force as a garrison.
The political impact of the surrender was much greater. The Congress was appalled, and they censured both Schuyler and St. Clair for the loss. Schuyler was removed as commander of the Northern Department and was replaced by General Gates. St. Clair maintained that his conduct had been honorable, demanded review by a court martial, and was completely exonerated.
Eventually, after Burgoyne's surrender at Saratoga, the British garrison at Ticonderoga withdrew to St. John's, and the Americans re-occupied Fort Ticonderoga with no major incidents.