A battering ram is a medieval weapon, essentially a very heavy weight on wheels, designed to break open castle walls or doors. They were usually made of a large tree trunk. Sometimes they were carried by a group of men, instead of being wheeled, or were slung from a support frame via ropes so that it could be repeatedly swung against its target.
Battering rams are still used in various roles in modern times, sometimes mounted on vehicles. SWAT teams often use small two-man battering rams for opening locked doors.
Legendary battering ram usage: