WWI: The Hindenburg Line is broken by Allied forces

29th September 1918

The Hindenburg Line was a vast system of defences in northeastern France during World War I. It was constructed by the Germans during the winter of 1916-17 and stretched from Lens to beyond Verdun.

The German command believed the new line was impregnable. However it was temporarily broken through during the Battle of Cambrai in 1917 and was successfully permanently breached in a number of locations during the Allied Hundred Days Offensive in September 1918.