At length a time came when the Romans could no longer defend their own native country against the nations in the north of Europe. The soldiers were then withdrawn from Britain (about the year 440), and the people left to govern themselves. The Caledonians, who did not like to be so much straitened in the north, took advantage of the unprotected state of the Britons to pour in upon them from the other side of the wall, and despoil them of their lives and goods. The British had no resource but to call in another set of protectors, the Saxons, a warlike people who lived in the north of Germany, and the Jutes and Angles, who inhabited Denmark. The remedy was found hardly any better than the disease. Having once acquired a footing in the island, these hardy strangers proceeded to make it a subject of conquest, as the Romans had done before, with this material difference, that they drove the British to the western parts of the island, particularly into Wales, and settled, with new hordes of their countrymen, over the better part of the land. So completely was the population changed, that, excepting in the names of some of the hills and rivers, the British language was extinguished, and even the name of the country itself was changed, from what it originally was to Angle-land or England, a term taken from the Angles. The conquest required about two hundred and fifty years to be effected, and, like that of the Romans, it extended no farther north than the Firths of Forth and Clyde. Before the Britons were finally cooped up in Wales, many battles were fought; but few of these are accurately recorded. The most distinguished of the British generals were the Princes Vortimer and Aurelius Ambrosius. It is probably on the achievements of the latter that the well-known fables of King Arthur and his knights are founded.