Authoritative English historian G.M.D. Parker, a lecturer at Magdalen College, Oxford, in his book examines all aspects of the internal organization of the Roman army from the time of the military reform of Gaius Marius to the beginning of the 3rd century AD. e. The scientist describes the symbols and paraphernalia of the units, the weapons and equipment of officers and soldiers, the features of service in peacetime and during military campaigns. Of particular interest are the chapters on the daily life of a legionnaire, the details of his service - payment, food, rewards and punishments. The scientist also talks about the system of monetary savings, the marital status of the legionnaires and the peculiarities of life in the castrum - a military camp.