Stephen, King of England recognised Stephen's son Eustace as Duke of Normandy in exchange for Eustace giving fealty to the French king. Stephen was less successful, however, in regaining the Argentan province along the Normandy and Anjou border, which Geoffrey had taken at the end of 1135. Stephen formed an army to retake it, but the frictions between his Flemish mercenary forces led by William of Ypres and the local Norman barons resulted in a battle between the two halves of his army. The Norman forces then deserted the King, forcing Stephen to give up his campaign. Stephen agreed to another truce with Geoffrey,
Norman conquest of England followers expected and received lands and titles in return for their service in the invasion, but William claimed ultimate possession of the land in England over which his armies had given him "de facto" control, and asserted the right to dispose of it as he saw fit. Henceforth, all land was "held" directly from the king in feudal tenure in return for military service. A Norman lord typically had properties located in a piecemeal fashion throughout England and Normandy, and not in a single geographic block. To find the lands to compensate his Norman followers, William initially confiscated the estates