1914–15.
Russia.
1. The 1st Reserve Division was on the Russian front from August, 1914, until November 1, 1917, at which time it entrained for France.
East Prussia-Poland.
2. In 1914 it and the 36th Reserve Division formed the 1st Reserve Corps (Gen. Otto von Buelow). It took part in the operations of East Prussia (Hindenburg’s Army), in the Lodz maneuver (Von Mackensen’s Army), and in the combats on the Bzura.
3. In February, 1915, the division was in the Prasnysz region, northeast of the Bohr-Narew line.
Courland.
4. In May, as part of Eichhorn’s Army, it took part in the raid on Courland.