Edwin angry as William had promised his daughter's hand in marriage to Edwin but had not yet followed through. Morcar's rule of Northumbria was cut down to half of the earldom. They were paraded around Normandy.
William led an army to Mercia and Northumbria (destroying housing and crops along the way) and defeated the earls. Kept them informally as prisoners until they escaped
Durham attacked, Robert Cumin killed. York attacked and conquered. Edgar marched down from Scotland to lead the rebellion. Castles were burnt down and 3000 Norman knights were killed.
Edgar marched down from Scotland. Was supported by the threat of King Sweyn of denmark (240 ships, anchored in River Humber) and King Malcom of scotland. York and its castles were seized and the garrisons were killed.
Although the combined powers seemed quite a threat to William, they all had independent goals so did not work together well enough. And William acted very decisively and confronted his threats head on.
Rebellion broke out in East Anglia at Ely. Guerrilla war campaign in marshy fenlands and stronghold was set up there. Had support of King Sweyn and Saxon earls Morcar and Edwin. Held out against Normans for a year.
Marshes were tricky to cross so built a bridge which broke at first due to wait of horses, armour etc. then built second bridge out of boats and his army was able to cross it. Defeated the rebels, imprisoned Morcar for life and killed Edwin.
Once rebels crossed marshes, rebels were easily defeated so rebels needed better equipment, training etc. Even if Hereward had beaten William, he would not have had enough support to rule England.
William had reduced the power of the earls and made earldoms smaller. Roger was a marcher earl and William had taken away previous privileges such as not paying taxes for earldom land.
Ralph contacted the danes. Cnut led a large invasion fleet. the rebels decided to launch their invasion in 1075 when William was away in Normandy and archbishop Lanfranc was acting as regent
Waltheof told Lanfranc the plan. Lanfranc wrote letters attempting to convince them to surrender. sent 2 royal armies north and stopped 2 rebel armies meeting. used castles to keep the earls within their earldoms. Danes arrived late, pillaged York again and returned home
rebellions no longer posed a serious threat to William- his regent easily dealt with the revolt. future rebellions unlikely if Norman earls cannot succeed. last anglo saxon earl lost title and land and executed