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So how come armies in Antiquity are recording at having been at sized as large as 80,000 (Rome at Cannae) or entire state armies being 400,000 men (on paper Roman Army size c. Constantine) yet as time passes armies in general seem to be quite smaller in the Middle Ages? The Strategicon for example calls an army of "15,000" large and the First Crusade's ~35,000 is seen as unprecedented in the scope of its size by contemporaries?

Was there a degradation in efficiency in recruitment or logistics? Or is it a question of numbers being inflated for antiquity?
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