Late Roman army
Military
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In modern scholarship, the "late" period of the Roman army begins with the accession of the Emperor Diocletian in AD 284, and ends in 480 with the death of Julius Nepos, being roughly coterminous with the Dominate. Wikipedia
Active: AD 284–480 (West) and to 640 ca. (East)
Engagements: Satala (298), Strasbourg (357), Ctesiphon (363), Adrianople (378) and Catalaunian Plains (Chalons) (451)
Size: Range: ca. 400,000–600,000