Sherman's neckties were a railway-destruction tactic used in the American Civil War. Named after Maj. Gen. William Tecumseh Sherman of the Union Army, Sherman's neckties were railway rails destroyed by heating them until they were malleable and twisting them into loops resembling neckties, often around trees. Since the Confederacy had limited supplies of iron, and few foundries to roll the rails, this destruction was very difficult to repair. They were also called Sherman's bow ties, Sherman's hairpins or Jeff Davis hairpins.