XXV.--Having delivered this message he marched to Brundusium with six legions, four of them veterans: the rest those which he had raised in the late levy and completed on his march, for he had sent all Domitius's cohorts immediately from Corfinium to Sicily. He discovered that the consuls were gone to Dyrrachium with a considerable part of the army, and that Pompey remained at Brundusium with twenty cohorts; but could not find out, for a certainty, whether Pompey stayed behind to keep possession of Brundusium, that he might the more easily command the whole Adriatic sea, with the extremities of Italy and the coast of Greece, and be able to conduct the war on either side of it, or whether he remained there for want of shipping; and, being afraid that Pompey would come to the conclusion that he ought not to relinquish Italy, he determined to deprive him of the means of communication afforded by the harbour of Brundusium. The plan of his work was as follows:--Where the mouth of the port was narrowest he threw up a mole of earth on either side, because in these places the sea was shallow. Having gone out so far that the mole could not be continued in the deep water, he fixed double floats, thirty feet on either side, before the mole. These he fastened with four anchors at the four corners, that they might not be carried away by the waves. Having completed and secured them, he then joined to them other floats of equal size. These he covered over with earth and mould, that he might not be prevented from access to them to defend them, and in the front and on both sides he protected them with a parapet of wicker work; and on every fourth one raised a turret, two stories high, to secure them the better from being attacked by the shipping and set on fire.