Stephen, King of England began to influence the loyalty of many Anglo-Norman barons, who feared losing their lands in England to Robert and the Empress, and their possessions in Normandy to Geoffrey. Many started to leave Stephen's faction. His friend and advisor Waleran was one of those who decided to defect in mid-1141, crossing into Normandy to secure his ancestral possessions by allying himself with the Angevins, and bringing Worcestershire into the Empress's camp. Waleran's twin brother, Robert of Leicester, effectively withdrew from fighting in the conflict at the same time. Other supporters of the Empress were restored in their former strongholds, such as
Norman conquest of England Count of Penthièvre. In August or September 1069 a large fleet sent by Sweyn II of Denmark arrived off the coast of England, sparking a new wave of rebellions across the country. After abortive raids in the south, the Danes joined forces with a new Northumbrian uprising, which was also joined by Edgar, Gospatric and the other exiles from Scotland as well as Waltheof. The combined Danish and English forces defeated the Norman garrison at York, seized the castles and took control of Northumbria, although a raid into Lincolnshire led by Edgar was defeated by the Norman garrison of Lincoln.