He held command of the 2nd Cavalry Brigade between 1910 and 1913 and was in command of the newly created Cavalry Division when Belgium was invaded by Germany in 1914. He was promoted to Lieutenant-General in August 1914, just 6 days before commanding his division at the Battle of Haelen. The Belgian victory at the battle, nicknamed the "Battle of the Silver Helmets" after the cavalry helmets left on the battlefield after the fighting, was an important incident of the campaign.