C. Julius Caesar, Commentaries on the Civil War
William Duncan, Ed.

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As they could then neither choose a proper place for a camp, nor continue their march, they were forced to halt where they were, far from any water, and on very disadvantageous ground. Caesar did not offer to attack them, for the reasons mentioned before: he would not even permit any tents to be pitched that day, that he might be the readier to pursue with all his forces, should they attempt to escape either by night or by day. The Afranians perceiving the disadvantage of their situation, employed the whole night in throwing up intrenchments, and disposed their camp directly fronting ours. The same they did the following day, from sun-rise till evening. But the farther they extended their camp, and produced their lines, in order to better their position, the farther they went from water, and to avoid one inconvenience, fell into another. The first night nobody went out of the camp for water, and the next day the whole army was obliged to do it in order of battle, so that they could not forage that day. Caesar waited to humble them by these misfortunes, and reduce them by want and necessity rather than force. He began, however, to draw lines round the camp, the better to check their sudden sallies and irruptions, to which he foresaw they would be obliged to have recourse at last. Want, soon constrained them to kill all the beasts of burden.