Upon mobilization, the 37th Division, with the 41st Division, formed the 20th Army Corps (Allenstein).
Russia.
1. At the beginning of the war the 37th Division was engaged on the Eastern Front. It took part in the battle of Tannenberg at the end of August, in the attempt against Warsaw in October, and in the battles on the Rawka during the winter of 1914 and 1915.
1915.
Russia.
1. In April, 1915, the 37th Division was on the Narew. In May it ceded the 146th Infantry Regiment to the 101st Division, a new formation. The battles lasted until the end of July on the Narew, which was crossed on the 31st. The division was at Bielostok at the end of August, and entered Grodno on September 2.
2. In the course of September, it advanced from Niemen to the Berezina, and in October it occupied a sector in the vicinity of Dvinsk (Lake Sventen) on the stabilized front. It remained there until its departure for the Western Front in December, 1916.
1916.
1. One of its regiments, the 150th Infantry Regiment, was temporarily detached at the time of the Russian offensive of 1916 on the Stokhod and then made a part of the 91st Division.