American Revolutionary War: British forces and their Iroquois allies attacked a fort and the village of Cherry Valley, New York, killing 14 soldiers and 30 civilians.

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 Iroquois, also known as the Five Nations, and later as the Six Nations from 1722 onwards; alternatively referred to by the endonym Haudenosaunee are an Iroquoian-speaking confederacy of Native Americans and First Nations peoples in northeast North America. They were known by the French during the colonial years as the Iroquois League, and later as the Iroquois Confederacy, while the English simply called them the "Five Nations". Their country has been called Iroquoia and Haudenosauneega in English, and Iroquoisie in French. The peoples of the Iroquois included the Mohawk, Oneida, Onondaga, Cayuga, and Seneca. After 1722, the Iroquoian-speaking Tuscarora people from the southeast were accepted into the confederacy, from which point it was known as the "Six Nations".

The Cherry Valley massacre was an attack by British and Iroquois forces on a fort and the town of Cherry Valley in central New York on November 11, 1778, during the American Revolutionary War. It has been described as one of the most horrific frontier massacres of the war. A mixed force of Loyalists, British soldiers, Senecas, and Mohawks descended on Cherry Valley, whose defenders, despite warnings, were unprepared for the attack. During the raid, the Seneca in particular targeted non-combatants, and reports state that 30 such individuals were killed, in addition to a number of armed defenders.