Lieutenant General Hugh Percy, 2nd Duke of Northumberland was an officer in the British army and later a British peer. He participated in the Battles of Lexington and Concord and the Battle of Long Island during the American War of Independence, but resigned his command in 1777 due to disagreements with his superior, General William Howe.

The Battles of Lexington and Concord was the first major military campaign of the American Revolutionary War, resulting in an American victory and outpouring of militia support for the anti-British cause. The battles were fought on April 19, 1775, in Middlesex County, Province of Massachusetts Bay, within the towns of Lexington, Concord, Lincoln, Menotomy, and Cambridge. They marked the outbreak of armed conflict between the Kingdom of Great Britain and Patriot militias from America's thirteen colonies.