Council, vesting Pompey with unprecedented powers and authorizing him to move against them. In a massive and concerted campaign, Pompey cleared the seas of the pirates in only three months.Appian, The Mithridatic Wars, § 95–§ 96 Afterwards, the fleet was reduced again to policing duties against intermittent piracy. Caesar and the Civil Wars In 56 BC, for the first time a Roman fleet engaged in battle outside the Mediterranean. This occurred during Julius Caesar's Gallic Wars, when the maritime tribe of the Veneti rebelled against Rome. Against the Veneti, the Romans were at a disadvantage, since they did not know the coast, and were inexperienced in fighting in the open sea with its tides and currents. Furthermore, the Veneti ships were superior to the light Roman galleys. They were built of oak and had no oars, being thus more resistant to ramming. In addition, their greater height gave them an advantage in both missile exchanges and boarding actions. In the event, when the two fleets encountered each other in Quiberon Bay, Caesar's navy, under the command of D. Brutus, resorted to the use of hooks on long poles, which cut the halyards supporting the Veneti sails. Immobile, the Veneti ships were easy prey for the legionaries who boarded them, and fleeing Veneti ships were taken when they became becalmed by a sudden lack of winds. Having thus established his control of the English Channel, in the next years Caesar used this newly built fleet to carry out two invasions of Britain. The last major campaigns of the Roman navy in the Mediterranean until the late 3rd century AD would be in the civil wars that ended the Republic. In the East, the Republican faction quickly established its control, and Rhodes, the last independent maritime power in the Aegean, was subdued by Gaius Cassius Longinus in 43 BC, after its fleet was defeated off Kos. In the West, against the triumvirs stood Sextus Pompeius, who had been given command of the Italian fleet by the Senate in 43 BC. He took control of Sicily and made it his base, blockading Italy and stopping the politically crucial supply of grain from Africa to Rome. After suffering a defeat from Sextus in 42 BC, Octavian initiated massive naval armaments, aided by his closest associate, Marcus Agrippa: ships were built at Ravenna and Ostia, the new artificial harbor of Portus Julius built at Cumae,