Macer, On Military Affairs, Book I. The duty of the commander of an army consists not only in enforcing discipline, but also in observing it. 1Paternus says that he who commands an army should remember to grant furloughs very sparingly, and not to permit a horse belonging to the military service to be taken out of the province where the soldiers are; and not to send a soldier to perform any private labor, or to fish or hunt; for this is laid down in the rules of discipline prescribed by Augustus. Although I know that it is not unlawful for soldiers to perform mechanical labor, still, I fear if I should allow any act to be performed for my benefit, or for yours, this would not be done in a way which would be tolerated by me. 2It is the duty of the tribunes, or of those who command the army, to confine the soldiers in camps; to compel them to go through their exercises; to keep the keys of the gates; sometimes to make the rounds of the watch; to oversee the distribution of grain; to test it to prevent fraud from being committed by those who measure it; to punish offences according to their authority; to be frequently present at headquarters to hear the complaints of their fellow-soldiers; and to inspect those who are ill.