The Roman army during the Second Punic War, a citizen army, developed also in parallel a professional army, the legiones cannenses or the Cannae's legions, formed by the veterans of the battle of Cannae (216 BCE). These units showed the same characteristics of the Late Republic and Imperial Roman army already one hundred years before the reforms of Marius.
But, how and why a citizen's army became a professional force?
There are three main...
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