1. The 1st Army Corps was engaged on the Russian front at the very beginning of the war.
2. Up until November the 1st Division participated in the operations of East Prussia, and notably in the battle of Tannenberg (Aug. 27–29).
3. In December the two divisions of the 1st Corps separated. The 2d Division remained in the north; the 1st Division went to the 9th Army, from December, 1914, to January, 1915 (Bzura-Rawka), then to the Army of the South, operating in the Carpathians and on the Dniester, from February, 1915, to February, 1916.
1916.
France.
1. The division went to France in March, 1916. The 41st Infantry Regiment detrained March 13 near Metz; the 48th Infantry Regiment at Hagondange March 5.
Verdun.
2. The division was put in line near Vaux April 20, fought in the bois de la Caillette in May, in the bois de Vaux Chapitre, and the bois Fumin in June and July. It suffered enormous losses there. In the 1st Company of the 41st Infantry Regiment, the numbers on the pay books passed from 1,359 (Apr. 10) to 1,674 (July 19), indicating the arrival of at least 316 reinforcements. From the beginning of the war until July, 1916, the regiment had received an average of 1,360 men per company.
Russia.
3. At the end of July, 1916, the 1st Division, leaving behind the 41st Infantry Regiment, which fought before Verdun in August, was once more taken to the eastern front, where it formed part of the Carpathian Corps.