Flavius Josephus, The Wars of the Jews
William Whiston, A.M., Ed.

[85] When they have thus secured themselves, they live together by companies, with quietness and decency, as are all their other affairs managed with good order and security. Each company hath also their wood, and their corn, and their water brought them, when they stand in need of them; for they neither sup nor dine as they please themselves singly, but all together. Their times also for sleeping, and watching, and rising are notified beforehand by the sound of trumpets, nor is any thing done without such a signal; and in the morning the soldiery go every one to their centurions, and these centurions to their tribunes, to salute them; with whom all the superior officers go to the general of the whole army, who then gives them of course the watchword and other orders, to be by them cared to all that are under their command; which is also observed when they go to fight, and thereby they turn themselves about on the sudden, when there is occasion for making sallies, as they come back when they are recalled in crowds also.