Named after the pacifistic Quaker movement, "quaker guns" were false cannons, usually made from logs painted black, that were used to deceive enemy spies or troops into believing a fort or emplacement had more artillery than they actually did. Quaker guns were used throughout the 18th and 19th centuries; one of the first recorded instances came in the American Revolution, when Colonel George Washington had surrounded a group of British Loyalists in a farmhouse and barn near Camden, South Carolina. Washington had a pine log prepared to resemble a cannon, pointed it at the Loyalist position, and threatened to open fire if they didn't surrender. The Loyalists gave up without a fight.
Quaker guns were also occasionally used during World War II to fool enemy reconnaissance. Wooden or inflatable rubber tanks were used for similar purposes.