Cadwallon and Penda began slaughtering the people of Northumbria. This included men, women and children. Cadwallon, according to Bede, although Christian was more barbarous than any pagan. Northumbria fell apart and divided back into its two former kingdoms of Deira and Bernicia. Oswald reunited Deira and Bernicia back into Northumbria. As King he restored Northumbria to the power it had under Edwin.