During the Great War, the Hindenburg Line was a vast and armed defense system built by the Germans in the north-west France. This decision was taken by the General Hindenburg and Ludendorff during the final stages of the battle of the Somme. Conceived as a strategic retreat line, it marked the first attempt to change the defensive tactics in order to save men and materials, waiting to unleash the decisive offensive once liquidated Russia. Considered inviolable, during the Hundred Days Offensive was overcome in several points by the Allied troops.
The Hindenburg Line