The Bernard Cornwell books set in this period are excellent for bringing it to life. The "hero" of the stories is Uhtred of Bebbanburg (modern day Bamburgh). The Battle of Cynuit is in there. Uhtred wins it for the King (just like Sharpe does in the other Bernard Cornwell books).
I'm not sure about calling the Anglo-Saxons "Brits". At this time, the true "Brits" had been pushed back into Wales and darkest Cornwall. Separate peoples from the Angle and Saxon invaders.
Murky times, indeed. And would be an excellent period for a new range of figures, if ever HaT needed more projects!