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

[89] Now when they are to go out of their camp, the trumpet gives a sound, at which time nobody lies still, but at the first intimation they take down their tents, and all is made ready for their going out; then do the trumpets sound again, to order them to get ready for the march; then do they lay their baggage suddenly upon their mules, and other beasts of burden, and stand, as at the place of starting, ready to march; when also they set fire to their camp, and this they do because it will be easy for them to erect another camp, and that it may not ever be of use to their enemies. Then do the trumpets give a sound the third time, that they are to go out, in order to excite those that on any account are a little tardy, that so no one may be out of his rank when the army marches. Then does the crier stand at the general's right hand, and asks them thrice, in their own tongue, whether they be now ready to go out to war or not? To which they reply as often, with a loud and cheerful voice, saying, "We are ready." And this they do almost before the question is asked them: they do this as filled with a kind of martial fury, and at the same time that they so cry out, they lift up their right hands also.