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 At the same time resistance flared up again in western Mercia, where the forces of Eadric the Wild, together with his Welsh allies and further rebel forces from Cheshire and Shropshire, attacked the castle at Shrewsbury. In the south-west, rebels from Devon and Cornwall attacked the Norman garrison at Exeter but were repulsed by the defenders and scattered by a Norman relief force under Count Brian. Other rebels from Dorset, Somerset and neighbouring areas besieged Montacute Castle but were defeated by a Norman army gathered from London, Winchester and Salisbury under Geoffrey of Coutances. Meanwhile, William attacked the Danes, who