In 1742 during the First Silesian War, Fouqué led a grenadier battalion and was named Governor of Glatz. The Calvinist dealt ruthlessly with Austrian irregulars in the Catholic County of Glatz, hanging many of them. Promoted to "Generalmajor" on 13 May 1743, he was named commander of the Infanterie-Regiment Nr. 33 a year later. He guarded Friedrich von der Trenck at the prison of Glatz until the adventurer escaped in 1746. Frederick the Great promoted Fouqué to "Generalleutnant" on 22 January 1751.