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From 1940 to 1941 he was Commanding Officer 26th Armoured Brigade and then became Director-General Armoured Fighting Vehicles at the War Office He became Brigadier General Staff 2nd Army in 1942 and in 1943 Chief of Staff 18th Army Group, Tunisia and then Chief of Staff 15th Army Group, Italy.
From December 1941 to August 1943 he was Commander-in-Chief of the German Fifteenth Army in France (The HQ of the 15th Army is today a museum in Tourcoing, near Lille in northern France, Musée du 5 Juin 1944).