Pilum

For other uses, see Pilum (disambiguation).

The pilum (plural pila) was a javelin commonly used by the Roman army in ancient times. It was generally about two metres long overall, consisting of an iron shank about 7 mm in diameter and 60 cm long with pyramidal head. The shank was joined to the wooded shaft by either a socket or a flat tang.

Design

The total weight of a pilum was between two and five kilograms, with the versions produced during the Empire being a bit lighter than those dating from the previous Republican era.

The iron shank was the key to the function of the pilum. The weapon had a hard barbed tip but the shank itself was not hardened. The softness of the shank would cause it to bend after impact, thus rendering the weapon useless to the enemy. More importantly, If the pilum struck the shield of an enemy it would embed itself into the shield's fabric, and this along with the bending of the shank would cause the shield to become unwieldy, forcing the enemy to discard it or waste time trying to pull it out. The former action tended to happen more often than the latter as affected soldiers couldn't risk removing the pilum without disrupting their formation during an advance or losing their lives during a melee.

Pila were divided into two models: heavy and light. Pictorial evidence suggests that some versions of the weapon were weighted by a lead ball to increase penetrative power but archeological specimens of this design variant are not so far known. Recent experiments have shown pila to have a range of approximately 30 metres (100 ft), although the effective range is up to 15–20 m (50–70 ft).

Legionaries of the Late Republic and Early Empire often carried two pila, with one sometimes being lighter than the other. Standard tactics called for Roman soldiers to throw one of them (both if time permitted) at the enemy, just before charging to engage with the gladius.

The effect of the pila throw was to disrupt the enemy formation by attrition and by causing gaps to appear in its protective shield wall.

Pila could also be used in hand-to-hand combat; one documented instance of this occurred at the Siege of Alesia, and another during Marcus Antonius's Parthian campaign. Additionally, pila could be employed as a thrusting implement and a barrier against cavalry charges. Some pila had small hand-guards, to protect the wielder if he intended to use it as a melee weapon, but it does not appear that this was common.

Vegetius' commentary

The late Roman writer Vegetius, in his work De Re Militari, wrote:

As to the missile weapons of the infantry, they were javelins headed with a triangular sharp iron, eleven inches (279 mm) or a foot long, and were called piles. When once fixed in the shield it was impossible to draw them out, and when thrown with force and skill, they penetrated the cuirass without difficulty.

And later in the same work:

They had likewise two other javelins, the largest of which was composed of a staff five feet and a half long and a triangular head of iron nine inches (229 mm) long. This was formerly called the pilum, but now it is known by the name of spiculum. The soldiers were particularly exercised in the use of this weapon, because when thrown with force and skill it often penetrated the shields of the foot and the cuirasses of the horse.

It may be argued that a short iron shaft has very few confirmations from archeology. Vegetius is writing about a one foot iron shaft because at Vegetius' time the pilum had disappeared and been replaced by similar shorter weapons such as the plumbatae or the above mentioned spiculum.

Results of experimental archaeology

Marching Soldiers

Thanks in part to experimental archaeology, it is generally believed that the pilum's design evolved to be armour-piercing: the pyramidal head would punch a small hole through an enemy shield allowing the thin shank to pass through and penetrate a distance sufficient to hit the man behind it. The thick wooden shaft provided the weight behind the punch.

In one description, one of the two iron nails that held the iron shaft in place was replaced with a weak wooden pin that would break on impact causing the shaft to twist sideways. Gaius Marius is sometimes given credit for this modification. It has been argued that later pila were constructed so that the iron shank would bend on impact. Having penetrated a shield through a small hole and its shank having bent, such a pilum would now be more difficult to remove, and, of course, impossible to throw back.

Further complications and injury could ensue if the understandably-reluctant enemy did not discard his precious shield quickly enough, as there would be a great press from the men behind him.

Opinion among archaeologists once held that the main function of the shank was to disable both shields and the pilum itself by bending, but it is now thought that the pilum was a form of "personal artillery" designed simply to provide a massive counter-shock against any charging foe, and, as necessary, turn any legionary into a spearman.

See also

• Pole weapon
• Javelin
• Verutum
• Lancea
• Spiculum
• Roman military personal equipment
• Spear
• Projectile
• Lance
• Hasta

Gallery

• 

  Reconstruction of a post-Marian pilum.

• 

  A Roman coin showing an antoninianus of Carinus holding pilum and globe.

• 

  Roman Legionary re-enactors armed with pila.

• 

  Close-up of re-enactment pila.

References

Plutarch (2005). Penguin Classics: Fall of the Roman Republic. Translated by Rex Warner, Robin Seager. Penguin Classic; Revised edition. ISBN 978-0140449341. 

• Connolly, Peter. Greece and Rome at War. Reprint: Greenhill Books, 1998 ISBN 185367303X.
• Connolly, Peter. "The pilum from Marius to Nero: a reconsideration of its development and function", Journal of Roman Military Equipment Studies, vol. 12/13, 2001/2, pp. 1-8.

External links

• The Pilum - The Roman Spear, Caerleon's Roman Legion
• Lance / Spear / Pilum / Catapult points, www.romanlegions.info
• Archaeological discovery of a pilum, Ecomuseum de Cap de Cavalleria.