The Battle of Cambrai was an important battle in the First World War. It took place near Cambrai, and lasted from 20th November to 7th December 1917. This battle was the first in the war, where tanks were used on a large scale. Cambrai was important because it was a railroad hub. In total, about 95.000 people where killed or captured. The battle did not result in a gain of territory of either side. Cambrai lay on the Hindenburg Line. That part of the Hindenburg line between Arras and Soissons was known as "Siegfried Line"