Why battering rams worked: stone walls crack under repeated blows
A battering ram is basically a heavy log with momentum, yet it toppled city walls for thousands of years. The secret lay in the walls themselves. Stone and brick resist being squeezed but crack when struck, and each blow widened the fractures until a hole opened wide enough for attackers to pour through.
The earliest possible depiction comes from the tomb of Khety, an Egyptian noble of the 11th Dynasty, showing two soldiers advancing on a fortress under a roofed shelter with a long pole. By the Iron Age, engineers in the Middle East and Mediterranean were hanging the log from a wheeled frame with ropes or chains, allowing a far heavier beam to be swung easily, often with a metal cap on its point. The Roman architect Vitruvius credited Ceras of Carthage with the first wheeled, roofed version, so slow that it was nicknamed the testudo, or tortoise.
Protection was essential. Canopies were usually covered with fresh wet hides to resist fire and to shield the crew from arrows and javelins. An Assyrian image from the 9th century BC shows the contest in full: defenders drop torches and hook a chain under the ram, while attackers haul on the chain to free it. Other defensive tricks included lowering sacks of sawdust to cushion the impact, pouring heated sand and dropping boulders from the battlements.
Designs varied. Some frames were made of lashed saplings light enough to carry on the shoulders. Capped rams had iron or steel heads, sometimes shaped as a ram's head and horns as a pun. Alexander the Great used a version running on rollers rather than hanging from chains, letting it build speed before impact. In the West, the first confirmed use was by the Romans against the town of Pometia around 503 BC; the Spartans used rams at Plataea in 427 BC.
Rams pushed builders to design ever cleverer walls, until gunpowder siege cannons in the later Middle Ages made them obsolete. Small handheld versions survive, used by police and soldiers to break through locked doors.
Source: Battering ram
