It is a matter of record that the Saxons invasions of Britain began in the last years of the Roman occupation, and then started in in full force after the Romans left the island in 410 AD.  They marched away, seemingly without a backward glance, leaving the Britons–after 400 years of occupation–to fend for themselves. Map retrieved from: http://historiarex.com/e/en/225-anglo-saxon-invasions From Gildas, writing in the 6th century: From Britain envoys set out with their complaints, their clothes (it is said) torn, their heads covered in dust, to beg help from the Romans. … The Romans … informed our country that they could not go on being bothered with such troublesome expeditions; that Roman standards, that great and splendid army, could not be worn out by land and sea for the sake of wandering thieves who had no taste for war. Rather, Read more…