Onager

The Onager (half-ass or Equus hemionus), is an animal of the Equidae family, related to the donkey and horse.

Onagers were used in ancient Sumer to pull chariots, circa 2600 BC.

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The name onager was later passed on to a post-classical Roman siege engine, which derived its name from the kicking action of the machine.

The onager consisted of a frame placed on the ground to which a vertical frame of solid timber was rigidly fixed at its front end; through the vertical frame ran an axle, which had a single stout spoke. On the extremity of the spoke was a cup to receive the projectile.

In action the spoke was forced down, against the tension of twisted ropes or other springs, by a windlass, and then suddenly released. The spoke thus kicked the crosspiece of the vertical frame, and the projectile at its extreme end was shot forward.