1914.
1. The 19th Division constituted, at the outbreak of the war, with the 20th Division, the 10th Army Corps (Hanover), which was a part of the 2d Army (Von Buelow).
Belgium-Marne.
2. On August 3 one of its brigades, the 38th, was at Malmedy for the attack upon Liége, where it went into action on the 5th. After the fall of Liége the 19th Division, going around Namur on the north, fought at Charleroi on the 23d, entered France on the 25th, and went into action at Guise, at St. Quentin. It took part in the battle of the Marne on the right of the 20th Division, and then withdrew with that division to the northwest of Reims.
Champagne.
3. In October it was in the same sector attached to the 7th Army (Von Heeringen) and remained during the winter of 1914–15.
1915.
Russia.
1. In March, 1915, the 73d Fusiliers left the division to become a part of the 111th Division (a new formation).
2. In April the 19th Division was sent (with the 20th) to Galicia, where it took part in the offensive of Mackensen’s army. This campaign caused heavy losses; in the 91st Infantry Regiment, between May and September, the casualties totaled 127 officers and 4,291 men. (Official List of casualties.)