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 and for centuries afterwards English was not well understood by the nobility. An estimated 8000 Normans and other continentals settled in England as a result of the conquest, although exact figures cannot be established. Some of these new residents intermarried with the native English, but the extent of this practice in the years immediately after Hastings is unclear. Several marriages are attested between Norman men and English women during the years before 1100, but such marriages were uncommon. Most Normans continued to contract marriages with other Normans or other continental families rather than with the English. Within a century of