American Revolutionary War: The bloody Battle of Oriskany prevents American relief of the Siege of Fort Stanwix.

The American Revolutionary War, also known as the Revolutionary War or American War of Independence, was the armed conflict that comprised the final eight years of the broader American Revolution, in which American Patriot forces organized as the Continental Army and commanded by George Washington defeated the British Army. The conflict was fought in North America, the Caribbean, and the Atlantic Ocean. The war's outcome seemed uncertain for most of the war. But Washington and the Continental Army's decisive victory in the Siege of Yorktown in 1781 led King George III and the Kingdom of Great Britain to negotiate an end to the war in the Treaty of Paris two years later, in 1783, in which the British monarchy acknowledged the independence of the Thirteen Colonies, leading to the establishment of the United States as an independent and sovereign nation.

The Battle of Oriskany was a major engagement of the Saratoga campaign during the American Revolutionary War. On August 6, 1777, an American column of Tryon County militia and Oneidas marching to relieve the siege of Fort Stanwix was ambushed by a contingent of Britain's Indigenous allies and Loyalists. It was one of the few battles of the war in which most non-Indigenous participants were settlers born in the Thirteen Colonies. The Americans suffered heavy casualties during the battle.

The siege of Fort Stanwix 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.