But it was not till the moment we have reached that the line of defences which had hitherto held the invaders at bay was turned by their appearance in the Humber and the Trent.

This great river-line led like a highway into the heart of Britain; and civil strife seems to have broken the strength of British resistance.

But of the incidents of this final struggle we know nothing.
One part of the English force marched from the Humber over the Yorkshire wolds to found what was called the kingdom of the Deirans.

Under the Empire political power had centred in the district between the Humber and the Roman wall; York was the capital of Roman Britain; villas of rich landowners studded the valley of the Ouse; and the bulk of the garrison maintained in the island lay camped along its northern border.

But no record tells us how Yorkshire was won, or how the Engle made themselves masters of the uplands about Lincoln.