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14 familiarised themselves with the practice of war; and it is prettily remarked by an ancient historian who had fought against them, that the effusion of blood was the only circumstance which distinguished a field of battle from a field of exercise. It was the pohcy of the ablest generals, and even of the emperors them- selves, to encourage these military studies by their presence and example; and we are informed that Hadrian, as well as Trajan, frequently condescended to instruct the unexperienced soldiers, to reward the diligent, and sometimes to dispute with them the prize of superior strength or dexterity. Under the reigns of those princes, the science of tactics was cultivated with success ; and as long as the empire retained any vigour, their military instructions were respected as the most perfect model of Roman discipline.

Nine centuries of war had gradually introduced into the service many alterations and improvements. The legions, as they are described by Polybius, in the time of the Punic wars, differed very materially from those which achieved the victories of Caesar, or defended the monarchy of Hadrian and the Antonines. The constitution of the imperial legion may be described in a few words. The heavy-armed infantry, which composed its principal strength, was divided into ten cohorts and fifty-five companies, under the orders of a correspondent number of tribunes and centurions. The first cohort, which always claimed the