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Legion

A "Legion" refers to a significant military unit in ancient Rome, typically comprising around 6,000 soldiers organized into ten cohorts. Each cohort was further divided into centuria, with roughly 100 men in each. Roman legionaries were equipped with specific weaponry, including a pilum (a long javelin) and a gladius (a short thrusting sword), along with protective gear like helmets, shields, and armor. The structure of the legion allowed for effective infantry support through cavalry, archers, and siege engines, which became increasingly important as the Roman army faced mobile threats such as barbarian raiders by the fourth century CE.

In contemporary contexts, the term "legion" has evolved to denote groups of mercenaries or foreign soldiers serving another nation, with the French Foreign Legion being one of the most notable examples. This transition highlights the legacy of the Roman military's organizational strategies and their lasting impact on modern military terminology and structure. Overall, the concept of a legion encapsulates both the historical military prowess of Rome and its influence on current military units around the world.

Full Article

The largest permanent unit in the ancient Roman military, legions, ideally composed of 6,000 soldiers, were divided into ten cohorts. Each cohort contained six centuria, each composed of approximately 100 men. Legionaries were armed with a seven-foot javelin called a pilum and a heavy thrusting sword with a twenty-inch blade called a gladius and protected by a helmet, convex shield, and cuirass. The infantry was supported by varying numbers of cavalry, archers, slingers, and, if concentrating upon defense or siege, catapults and ballistae. By the fourth century CE, the proportion of cavalry to infantry had significantly increased because the Roman army needed more mounted soldiers to combat mobile barbarian raiders.

In modern times, the term “legion” has come to mean a body of mercenaries or foreign troops in the service of another country. The French Foreign Legion (1831–2000), composed of foreign volunteers under French officers, is the most famous of these.


Bibliography

Bileta, Vedran. "What Was the Roman Legion?" TheCollector, 20 Feb. 2023, www.thecollector.com/what-was-the-roman-legion/. Accessed 26 Oct. 2025.

de Lima, Carolina Rangel. "Introduction to Legion: Life in the Roman Army." The British Museum, 18 Oct. 2023, www.britishmuseum.org/blog/introduction-legion-life-roman-army. Accessed 26 Oct. 2025.

"Roman Legions: The Backbone of the Roman Military." History Extra, 3 Feb. 2022, www.historyextra.com/period/roman/roman-legion-how-fight-how-many-men-weapons-armour-legionary-centurion/. Accessed 26 Oct. 2025.

Full Article

The largest permanent unit in the ancient Roman military, legions, ideally composed of 6,000 soldiers, were divided into ten cohorts. Each cohort contained six centuria, each composed of approximately 100 men. Legionaries were armed with a seven-foot javelin called a pilum and a heavy thrusting sword with a twenty-inch blade called a gladius and protected by a helmet, convex shield, and cuirass. The infantry was supported by varying numbers of cavalry, archers, slingers, and, if concentrating upon defense or siege, catapults and ballistae. By the fourth century CE, the proportion of cavalry to infantry had significantly increased because the Roman army needed more mounted soldiers to combat mobile barbarian raiders.

In modern times, the term “legion” has come to mean a body of mercenaries or foreign troops in the service of another country. The French Foreign Legion (1831–2000), composed of foreign volunteers under French officers, is the most famous of these.


Bibliography

Bileta, Vedran. "What Was the Roman Legion?" TheCollector, 20 Feb. 2023, www.thecollector.com/what-was-the-roman-legion/. Accessed 26 Oct. 2025.

de Lima, Carolina Rangel. "Introduction to Legion: Life in the Roman Army." The British Museum, 18 Oct. 2023, www.britishmuseum.org/blog/introduction-legion-life-roman-army. Accessed 26 Oct. 2025.

"Roman Legions: The Backbone of the Roman Military." History Extra, 3 Feb. 2022, www.historyextra.com/period/roman/roman-legion-how-fight-how-many-men-weapons-armour-legionary-centurion/. Accessed 26 Oct. 2025.

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