The siege of Fort Stanwix (also known as Fort Schuyler) began on August 2, 1777, and ended on August 22, 1777. Fort Stanwix, at the western end of the Mohawk River Valley, was a primary defense point for the Continental Army against the British and Indigenous forces aligned against them during the American Revolutionary War. The fort was occupied by Continental Army forces from New York and Massachusetts under the command of Colonel Peter Gansevoort. The besieging force was composed of British regulars, Loyalist soldiers, Hessians, and Indigenous warriors, under the command of Brigadier General Barry St. Leger. St. Leger's expedition was a diversion in support of Lieutenant General John Burgoyne's campaign to take control of the Hudson River Valley to the east.
One attempt at relief was thwarted early in the siege when a force of New York militia under Brigadier General Nicholas Herkimer was ambushed on August 6 at the Battle of Oriskany by a large detachment of St. Leger's forces. While the battle did not involve the fort's garrison, some of its occupants sortied and plundered the nearly empty Indigenous and Loyalist camps, which was a blow to the morale of St. Leger's Indigenous allies. The siege was finally broken when American reinforcements under the command of Major General Benedict Arnold approached, and Arnold used a ruse to convince the besiegers that he had a much larger force. This misinformation, combined with the departure of many of the Indigenous warriors, led St. Leger to abandon the effort and withdraw.
St. Leger's failure to advance on Albany contributed to Burgoyne's surrender following the Battles of Saratoga in October 1777. Although St. Leger reached Fort Ticonderoga with some of his forces in late September, he was too late to aid Burgoyne.
Fort Stanwix occupied a strategic western portage known as the Oneida Carrying Place (site of modern Rome, New York) between the Mohawk River, which flowed southeast to the Hudson River, and Wood Creek, whose waters ultimately led to Lake Ontario. Built by the British in 1758 during the French and Indian War on the only dry ground in the area, the fort had fallen into disrepair. When the American Revolutionary War widened in 1776 to include the frontier areas between New York and the Province of Quebec, the site again became strategically important.
British Colonial Secretary Lord Germain and General John Burgoyne developed a plan for gaining control of the Hudson River valley that included an expedition that King George III described as a "diversion on the Mohawk River". In March 1777 Germain issued orders assigning the expedition to Lieutenant Colonel Barry St. Leger, an experienced frontier fighter who had served in the French and Indian War.
European colonization of North America accelerated after 1600, with England, France, Spain, and the Netherlands establishing competing settlements along the Atlantic coast, the St. Lawrence River, the Gulf of Mexico, and the Mississippi Valley. The first permanent English settlement at Jamestown, Virginia (1607) struggled with starvation and conflict; the Plymouth colony (1620) and the Massachusetts Bay Colony (1630) followed. By the mid-1700s, thirteen English colonies stretched along the Atlantic seaboard, governed through a mix of royal charters, proprietary grants, and elected assemblies. The colonial economy depended on tobacco in Virginia and Maryland, rice and indigo in the Carolinas, and maritime trade in New England — all increasingly reliant on enslaved African labor after 1619. Conflict with Indigenous peoples over land was continuous, punctuated by major wars including King Philip's War (1675–1676) in New England and the Yamasee War (1715–1717) in the South. The French and Indian War (1754–1763), part of the global Seven Years' War, ended French power in North America and left Britain deeply in debt — triggering the taxation disputes that would lead to revolution.
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