The division was mobilized as the 6th Infantry Division in August 1914 and sent to the west for the opening campaigns of the war. In 1914 it fought in the Battle of the Marne and the Race to the Sea. It then settled into positional warfare in the trenches along the Somme. The division was sent east in late 1915 to participate in the Serbian Campaign. It fought in the early phases of the Battle of Verdun and in the Battle of the Somme in 1916. In mid-1917, it was sent to the Eastern Front in response to the Russian Kerensky Offensive. It returned to the Western Front in September 1917, and remained there until war's end, participating in the Second Battle of the Aisne in 1917 and in the German Spring Offensive of 1918 and the Allied offensives that followed. The division was rated among the best in the German Army by Allied intelligence.