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

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Pompey would neither leave the sea and Dyrrhachium, where he had all his magazines and engines of war, and whence he was supplied with provisions by means of his fleet; nor could prevent the progress of Caesar's works, without fighting, which, at that time, he was determined against. He could do nothing therefore but extend himself, by taking as many hills, and as large a circuit of country as possible, to give his adversary the more trouble, and divide his forces. This he did, by raising twenty-four forts, which took in a circumference of fifteen miles, wherein were arable and pasture lands, to feed his horses and beasts of burden. And as our men had carried their circumvallation quite round, by drawing lines of commuication from fort to fort, to prevent the sallies of the enemy, and guard against the attacks in the rear; in like manner, Pompey's men had surrounded themselves with lines, to hinder us from breaking in upon them, and charging them behind. They even perfected their works first, because they had more hands, and a less circuit to inclose. When Caesar endeavoured to gain any place, Pompey, though determined not to oppose him with all his forces, nor hazard a general action, failed not, however, to detach parties of archers and slingers; who wounded great numbers of our men, and occasioned such a dread of their arrows, that almost all the soldiers furnished themselves, with coats of danger.