Mercs or professional army?

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Originally Posted by Sakkura

In any case, accensi are better than leves and remain available in polybian barracks.

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I think I recall accensi (half as many men as leves) having more than half the upkeep of leves. At any rate, the units I use for garrisoning don't have to be leves, they just need to be large and cheap. I make a lot of use of akontistai and, latterly, vigiles.