Sledge Bros. is an enemy, first appearing in Super Mario Bros. 3.
They are subspecies of Hammer Bros. They throw large sledge hammers instead of normal hammers and they can create small earthquakes by jumping which can stun the player.
Super Mario Bros. 3
In Super Mario Bros. 3, Sledge Bros. can create small earthquakes to disorientate Mario; it stops Mario/Luigi from moving, allowing it to continue to throw its hammers in succession. Mario/Luigi must jump as soon as it hits the ground(after it jumps) to maintain posture. Encountered first on World 5-Giant Land.