Alhred was expelled by the Northumbrian nobles and people in 774. Northumbria had become deeply unstable: between 758 and 796 eight kings were killed or expelled. Alcuin lamented this as divine punishment. The instability made Northumbria ripe for Danish conquest a century later.
The size of the opposing forces is not recorded in the surviving sources.
Pick any location and Aubrey pulls together everything the record actually holds about it:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Aubrey generates in-depth historical research for any location in the UK — drawing on Domesday records, scheduled monuments, Victorian OS maps, geological data and archaeological archives to tell the full story of a place.