Scorpio (weapon)

Design
See also: Torsion siege engine, Onager (weapon), Ballista, and Polybolos

Two versions are known; a horizontal two-armed variety like a ballista and a one-armed, vertical version otherwise referred to as an onager. The fourth century army officer and historian Ammianus Marcellinus witnessed the use of scorpiones during several engagements in the Persian wars of Constantius II, and described the one-armed version as synonymous with the onager, with the vertical upraised arm as the 'scorpion's sting'.[2]

The complexity of construction and in particular the torsion springs (which the Romans referred to as tormenta) led to great sensitivity to any variation in temperature or moisture, which limited their use. While this type of technology continued to be used in the Byzantine Empire, which was the continuation of the Roman Empire through the Middle Ages, it had disappeared in the Middle Ages in Western Europe.

A modern reconstruction of the scorpio.

Media
  • Modern reconstruction
  • Scorpio in fortified position
  • Scorpio mounted on walls
  • Dacian scorpio
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References
  1. Vitruvius, De Architectura, X:10:1-6.
  2. Ammianus Marcellinus, Roman History, XXIII:4.
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