A thousand pound battering ram with forty men to swing it could have shattered the barrier no more completely.

The ram swung and the door shattered and fell away.

According to Vegetius, it was given this name because the ram would swing out of the shelter much like a tortoise's head comes out of its shell.

The battering rams swung forward again.

A second later, the immense battering ram swung forward.

Inside sheds covered with green hides, rams swung on their chains.

Again and again the great rams swung and crashed.