Carroballista

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A Roman carroballista from the time of Trajan 046 Conrad Cichorius, Die Reliefs der Traianssaule, Tafel XLVI (Ausschnitt 01).jpg
A Roman carroballista from the time of Trajan

Carroballista was an ancient, cart-mounted ballista, a type of mobile field artillery. According to the Roman author Vegetius (Epitoma rei militaris II.25), each legion had 55 carroballistae (one per centuria ) which were arrow/bolt-shooter of the cheiroballistra type. Vegetius tells us that each carroballista was carried by mules and operated by one contubernium (i.e., eight soldiers commanded by one decanus ). Surviving representation of a carroballista are from the bas-reliefs of Trajan's Column (Scene XL and Scenes LXV/LXVI) and the Column of Marcus Aurelius.

Contents

Structure

Roman cart-mounted ballista (Trajan's Column) 031 Conrad Cichorius, Die Reliefs der Traianssaule, Tafel XXXI (Ausschnitt 01).jpg
Roman cart-mounted ballista (Trajan's Column)
Roman cart-mounted ballista on the Column of Marcus Aurelius Roman Carroballista, Column of Marcus Aurelius, Rome, Italy.jpg
Roman cart-mounted ballista on the Column of Marcus Aurelius

The structure of the carroballista machine is identical to that of the cheiroballistra or manuballista. It seems that the technical innovations introduced by the adoption of the cheiroballistra by the Roman army at the end of the 1st century AD made the use of the cart possible. In fact, the light but stout metal spring-frame and the wider space in the frontal part of the machine given by the arched strut conferred a greater manoeuvrability to the whole ballista.

Shooting position

According to the Trajan's column representation (Scene XL), the carroballista was manoeuvred by one man mounted on the cart with the ballista and by another man positioned behind the cart and operating probably some sort of winch handle. The presence of the mules in front of the cart suggests that the carroballista could be easily moved through the battlefield whilst shooting bolts. This interpretation is not unanimously accepted by scholars.

It is not certain that the ballistae are actually shooting. The whole representation could be simply an image of carts transporting ballistae to their destination nest on the battlefield. But the bolts or arrows are here depicted in a ready-to-fire position, hazardous for artillerymen if the ballistae are simply being transported in order to be dismounted and deployed on the battlefield.

In another section of the Trajan's column (Scene LXVI) the simple transportation of the ballista is depicted and now we have no arrows or bolts ready to be released on the ballista, the ballista is empty, and no artilleryman is manoeuvring the machine. An artilleryman is pulling the cart near the wheel and this suggests that the whole machine must have been quite a heavy structure.

Structure of the cart

A four-wheeled ballista drawn by armoured horses, from an engraving illustrating a 1552 edition of De rebus bellicis. Ballista-quadrirotis.jpeg
A four-wheeled ballista drawn by armoured horses, from an engraving illustrating a 1552 edition of De rebus bellicis .

It is sure that the cart was pulled by two mules or horses and that the size was probably that of standard Roman carts, i.e. c. 5 Roman feet (c. 147 cm) width (as depicted in the Trajan's Column, Scene XL and Scene LXVI), but the whole design of the cart is uncertain.

There are many hypotheses about the structure of the cart and probably different models of the same machine seem to have been in use at the same time:

Many scholars do not have an opinion about this problem, due to scarce evidence, as clearly stated by Alan Wilkins.

See also

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References

  1. About this hypothesis and a proposal of reconstruction of a carroballista of this type, see W. Soedel and V. Foley, Scientific American , March 1979, pp. 150–160.

Sources

Commons-logo.svg Media related to Carroballista at Wikimedia Commons