Roman navy
The Roman navy contained probably 30,000–40,000 marines, sailors and oarsmen, of which 15,000–20,000 in the Mediterranean fleets at Misenum and Ravenna (contrary to popular belief, Roman warships of this period were not rowed by the forced labour of convicts or slaves, but by volunteer professional oarsmen) and perhaps the same again in the "classis Britannica" (English Channel fleet) and the fluvial flotillas on the Rhine and Danube.