Siege of Fort Ticonderoga

The fall of Fort Ticonderoga in July 1777 was a shocking blow to American confidence and a crucial early success for Burgoyne's invasion from Canada. Ticonderoga was considered virtually impregnable — it had been the site of one of the French and Indian War's most dramatic British defeats — and its loss without a major battle appalled Congress and the public.

Burgoyne's engineers identified the critical flaw in Ticonderoga's defenses: Sugar Loaf Hill (later called Mount Defiance) dominated the fort but had been left unfortified because American commanders considered it too steep to place artillery on. Burgoyne's men proved them wrong, hauling cannon up the hillside with enormous effort. Once the British guns overlooked the fort from Sugar Loaf Hill, the position became completely untenable.

Realizing evacuation was necessary, General St. Clair led his garrison away by night on July 5-6. Most escaped successfully, though rear-guard fighting at Hubbardton inflicted significant casualties on both sides. The abandonment of Ticonderoga without a fight led Congress to call for St. Clair's court-martial, though he was ultimately acquitted. The fort's fall opened the road south to Albany but brought Burgoyne no closer to his ultimate defeat — it simply meant the decisive contest would be fought at Saratoga rather than Ticonderoga.