On mobilisation for World War I in August 1914, he became commander of the 3rd Reserve Division from Danzig, and promoted to Generalleutnant on the 19th of that month. He commanded this division as part of the 8th Army in the pivotal Battle of Tannenberg at the opening of the war on the Eastern Front, and at the subsequent First Battle of the Masurian Lakes. For his performance in this period, he was awarded the Pour le Mérite on 1 December 1914.