Early in the campaigning season, Marlborough attempted to launch an invasion of France up the Moselle valley. This effort was halted by a combination of supply shortages and an excellent French defensive position in front of Sierck, and Marlborough and his army were recalled by the Dutch States General when Marshall Villeroi attacked and took the fortress of Huy and threatened Liege. Having rushed back to the Low Countries (and forcing Villeroi to retreat behind his defenses), Marlborough retook Huy, and then planned to break through the lines to bring Villeroi to battle.