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Allectus, which had been stationed off the Isle of Wight to receive them, landed in safety on some part of the western coast, and convinced the Britons that a superiority of naval strength will not always protect their country from a foreign invasion. Asclepiodotus had no sooner disembarked the Imperial troops than he set fire to his ships; and, as the expedition proved fortunate, his heroic conduct was universally admired. The usurper had posted himself near London, to expect the formidable attack of Constantius, who commanded in person the fleet of Boulogne; but the descent of a new enemy required his immediate presence in the West. He performed this long march in so precipitate a manner that he encountered the whole force of the præfect with a small body of harassed and disheartened troops. The engagement was soon terminated by the total defeat and death of Allectus; a single battle, as it has often happened, decided the fate of this great island; and, when Constantius landed on the shores of Kent, he found them covered with obedient subjects. Their acclamations were loud and unanimous; and the virtues of the conqueror may induce us to believe that they sincerely rejoiced in a revolution which, after a separation of ten years, restored Britain to the body of the Roman empire.^[1]

Defence of the frontiers Britain had none but domestic enemies to dread; and, as long as the governors preserved their fidelity, and the troops their discipline, the incursions of the naked savages of Scotland or Ireland could never materially affect the safety of the province. The peace of the continent, and the defence of the principal rivers which bounded the empire, were objects of far greater difficulty and importance. The policy of Diocletian, which inspired the councils of his associates, provided for the public tranquillity, by encouraging a spirit of dissension among the barbarians, and by Fortifications strengthening the fortifications of the Roman limit. In the East he fixed a line of camps from Egypt to the Persian dominions, and, for every camp, he instituted an adequate number of stationary troops, commanded by their respective officers, and supplied with every kind of arms, from the new arsenals which he had formed at Antioch, Emesa, and Damascus.^[2] Nor was the precaution of the emperor less watchful against the well-known valour of the barbarians of Europe. From the mouth of the Rhine to that of the Danube, the ancient camps, towns, and

1. With regard to the recovery of Britain, we obtain a few hints from Aurelius Victor and Eutropius. [Chief source: Incerti Paneg. Constantio.]
2. John Malala, in Chron. Antiochen. tom. i. p. 408, 409 [p. 308, ed. Bonn].