Most people are aware of the Norman invasion of England in 1066 when there was a battle near Hastings and that was it, England conquered in one go. The reality is that England was not fully conquered until 1075, William having to deal with various revolts around the country.
What I have tried to replicate is the Danish and Saxon forces that joined up to form the Northumbrian uprising, they had also been joined by exiles from Scotland. The combined Danish and Saxon forces defeated the Norman garrison at York, seized the castles and took control of Northumbria.
As news arrives to say the Norman army is advancing, the joint force prepares for battle by creating a shield wall consisting of housecarls, thegns and the Fryd.
Archers are deployed at the rear of the shield wall and at strategic points the nobles are positioned to give encouragement and to plug any gaps made in the wall.
Cavalry cover the flanks, and try to take control of the small bridges crossing the waterways.