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

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When the intrenchments were finished, Caesar had notice from his scouts, that a certain number of the enemy's cohorts, which to them appeared a complete legion, were retired behind a wood, and seemed to be on their march to the old camp. The situation of the two armies was this: some days before, when Caesar's ninth legion was sent to oppose a body of Pompey's troops, they thought proper to intrench themselves upon an opposite hill, and form a camp there. This camp bordered upon a wood, and was not above four hundred paces from the sea. But afterwards, for certain reasons, Caesar removed a little beyond that post; and Pompey, a few days after, took possession of it. But as his design was to place several legions there; leaving the inner rampart standing, he surrounded it with greater works. Thus the smaller camp, inclosed within one of larger circumference, served by way of a castle or citadel. He likewise carried an intrenchment from the left angle of the camp to the river, through a space of about four hundred paces, which enabled him to water freely and without danger. But he too, soon after, changed his mind, for reasons which it is not needful to repeat here; and abandoned the place, which thereby was left several days without troops, though the fortifications remained entire.