Saxon Fall: The Rise of the Warlord — Griff Hosker

There is a new Warlord and he has to face the threat of an invasion from Northumbria. The world is changing and the loyalties of some of his allies are questioned. When treachery strikes then the men of Rheged are forced to defend their homes with their lives. The novel climaxes in the historical battle of Hatfield when the Mercians and the Welsh face the Northumbrians of King Edwin.