buy now $11.39 A 5th Century training manual for the organization, weapons and tactics of the Roman Legions. Vegetius s De Re Militari was the only major work of Roman military science to survive from classical times. It was widely studied in the Middle Ages and was a key source for Medieval warfare and siege tactics. Illustrated. The post On Roman Military Matters; A 5th Century Training Manual in Organization, Weapons and Tactics, as Practiced by the Roman Legions appeared first on The Art Of War.