"A mine flail is a vehicle-mounted device that makes a safe path through a mine-field by deliberately detonating land mines in front of the vehicle that carries it. They were first used by the British during World War II.The mine flail consists of a number of heavy chains, ending in fist-sized steel balls, (flails) that are attached to a horizontal, rapidly rotating rotor mounted on two arms in front of the vehicle."@en . . .