The Hohenzollern Redoubt action, 2–18 March 1916 was fought on the Western Front during the First World War. The Hohenzollern Redoubt was a German defensive position north of Loos-en-Gohelle (Loos), a mining town north-west of Lens in France. The Redoubt was fought over by the British and German armies from the Battle of Loos (25 September – 8 October 1915) to the beginning of the Battle of the Somme on 1 July 1916. Over the winter of 1915–1916, the 170th Tunnelling Company RE dug several galleries under the German lines in the area of the redoubt, which had changed hands several times since September 1915. In March 1916, the west side was held by the British and the east side was occupied by the Germans, with the front near a new German trench known as The Chord. No man's land had become