The Britons had long remained in this rude but independent state, when Cæsar, having overrun all Gaul by his victories, first cast his eye on their island. He was not allured either by its riches or its renown; but being ambitious of carrying the Roman arms into a new world, then mostly unknown, he took advantage of a short interval in his Gaulic wars, and made an invasion on Britain. The natives, informed of his intention, were sensible of the unequal contest, and endeavored to appease him by submissions, which, however, retarded not the execution of his design. After some resistance, he landed, as is supposed, at Deal, [Anno ante, C. 55;] and having obtained several advantages over the Britons, and obliged them to promise hostages for their future obedience, he was constrained, by the necessity of his affairs, and the approach of winter, to withdraw his forces into Gaul. The Britons relieved, from the terror of his arms, neglected the performance of their stipulations; and that haughty conqueror resolved next summer to chastise them for this breach of treaty. He landed with a greater force; and though he found a more regular resistance from the Britons, who had united under Cassivelaunus, one of their petty princes, he discomfited them in every action. He advanced into the country; passed the Thames in the face of the enemy; took and burned the capital of Cassivelaunus; established his ally, Mandubratius, in the sovereignty of the Trinobantes; and having obliged the inhabitants to make him new submissions, he again returned with his army into Gaul, and left the authority of the Romans more nominal than real in this island.
The civil wars which ensued, and which prepared the way for the establishment of monarchy in Rome, saved the Britons from that yoke which was ready to be imposed upon them. Augustus, the successor of Cæsar, content with the victory obtained over the liberties of his own country, was little ambitious of acquiring fame by foreign wars; and being apprehensive lest the same unlimited extent of dominion, which had subverted the republic, might also overwhelm the empire, he recommended it to his successors never to enlarge the territories of the Romans. Tiberius, jealous of the fame which might be acquired by his generals, made this advice of Augustus a pretence for his inactivity.[*]