The Arcuballista | Weapons of History

The Roman military employed a diverse arsenal of weapons, and the arcuballista stands as a particularly intriguing, yet enigmatic, entry in that list. Our understanding of this weapon hinges largely on a single source: Vegetius' "Epitoma rei militaris," a military treatise from the 4th century AD.
In his book, Vegetius describes soldiers using "manuballistae" and "arcuballistae" in battle formations. While "manuballista" is generally translated as a handheld catapult, the term "arcuballista" literally translates to "arch-thrower," leaving its exact nature ambiguous. Was it a bow-based weapon, or something else entirely?
Scholars debate this point. Some believe the arcuballista was simply another name for a handheld catapult, aligning with the "manuballista." Others, however, see the distinction Vegetius makes as evidence for a different type of weapon.
Further clues emerge in Vegetius' later writings. He differentiates between "scorpions" (earlier handheld catapults) and "arcuballistae" alongside slings and staff-slings. This grouping implies the arcuballista, like the others, was a handheld weapon.
Adding to the mystery are Gallo-Roman reliefs from Salignac and Saint Marcel. These reliefs depict crossbow-like weapons lacking the features of earlier, belly-bowed crossbows. Notably absent are winching mechanisms for drawing the bow, suggesting a handheld design.
Based on these reliefs, we have roughly figured out what the arcuballista looked like. The design features a self-bow or composite bow (both used by Romans) and lacks the steel prod seen in later medieval crossbows.
The lack of depicted spanning devices suggests a hand-spanning mechanism. its theorized the soldier (arcuballistarius) would use their feet on either side of the stock and pull the string by hand. This implies a manageable draw weight for a handheld weapon.
Based on the reliefs, estimations suggest a stock length of 60-70 cm and a bow length of around 130 cm. Arrows, rather than shorter bolts, might have been used due to the assumed longer draw length compared to later crossbows.
The Saint Marcel relief hints at a revolving nut mechanism, potentially similar to later finds from Britain. This nut may have been released using a trigger bar or a rear handle, but the exact mechanism remains unclear.
The arcuballista remains a topic of debate among scholars. While the available evidence suggests a handheld crossbow-like weapon, details regarding its exact design and operation are still being pieced together.
SOURCES:
www.worldhisto...
www.britannica...
ROMAN LEGIONARY AD 69-161 by ROSS COWAN
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