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

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Accordingly, after proper care taken of the sick and wounded, and as soon as night approached, he sent all the baggage privately towards Apollonia, under a guard of one legion, with orders not to halt till they had reached the place. This affair despatched, he made two legions remain in the camp, and marching out all the rest about three in the morning at several gates, ordered them to follow the same route the baggage had taken. Soon after, that his departure might not have the appearance of a flight, and yet be known to the enemy as late as possible, he ordered the usual signal to be given, and setting out with the rest of his forces, lost sight of the camp in a moment. Pompey hearing of his retreat, prepared to follow him without delay, and hoping to surprise the army in its march, whilst encumbered with baggage, and not yet removed from its consternation, drew out all his troops, and sent out all his cavalry before to retard our rear, which, however, he could not overtake, because Caesar marching without baggage, had got a great way before him. But when we came to the river Genusus, we found the banks so steep and difficult, that before all the men could get over, Pompey's cavalry came up, and fell upon our hindmost battalions. Caesar sent his horse to oppose them, intermixed with some light-armed troops; who charged with that vigour and success, as to put them all to rout, and leave a considerable number dead upon the field, and return without loss to the main body of their army.