The Hohenzollern Redoubt (Hohenzollernwerk) was a defensive strongpoint of the German 6th Army on the Western Front during World War I, at Auchy-les-Mines near Loos-en-Gohelle in the Nord-Pas-de-Calais region of France. Named after the House of Hohenzollern, the redoubt was fought over by German and Allied forces. Engagements took place from the Battle of Loos (25 September – 14 October 1915) to the beginning of the Battle of the Somme on 1 July 1916, including the Action of the Hohenzollern Redoubt in 1915 and another British attack, Hohenzollern Redoubt from 2–18 March 1916.