Louis' most important act was the defeat of the joint attack from England and Emperor Henry V in 1124. Louis was saved by the fast action of the vassals who organised huge numbers of men to move against the threat. Emperor Henry V actually turned back before engaging the French.
Louis arranged the marriage of Eleanor of Aquitaine to his son, the future Louis VII, in an attempt to increase the territories his family could own. The Duke of Aquitaine possessed a quarter of France. Louis died in 1137 shortly after arranging the marriage and was succeeded by his son Louis.