Siege engines

thumb|Basic diagram of an Onager (weapon)|onager, a type of catapult

siege engine originating in ancient times

siege engine

device that is designed to break or circumvent city walls and other fortifications in siege warfare

Helepolis (, meaning: "Taker of Cities") is the Greek name for a movable siege tower.

right|thumb|A replica of an ancient scaling ladder used for escalade, in Xi'an, [[China]] Escalade is the act of scaling defensive walls or ramparts with the aid of ladders. Escalade was a prominent feature of sieges in ancient and medieval warfare. Although no longer common in modern warfare, escalade technologies are still developed and used in certain tactical applications.