On his return to France he was made maítre-de-camp général de la cavalerie. Rosen continued his career on the continent where he served under the Dauphin in Germany. In 1691 he commanded the sector of Cuesmes (or Quesme) south-east of the town in the siege of Mons under Boufflers. He commanded the right wing under Luxembourg in the Battle of Landen in July 1693. His son Georges-Christophe and his son-in-law Meinrad von Planta were killed in this battle. He also took part in the siege of Charleroi in October.