Hohenzollern Redoubt, German military fortification in Auchy-les-Mines, France

The Hohenzollern Redoubt is a German military fortification in Auchy-les-Mines built on former mining waste heaps and extending across roughly 300 yards. Its curved design provided defenders with strong positions from which to resist attacks from multiple directions.

The Hohenzollern Redoubt was built by German forces in 1915 on a slight rise near Fosse 8, ordered as part of Erich von Falkenhayn's programme of rear defensive lines. British troops took it at the start of the Battle of Loos on 25 September 1915, then lost most of it to counter-attacks, holding only the west side. The final British assault of 13 October 1915 cost 3,643 casualties, mostly in the first minutes. In March 1916 British tunnellers blew four mines under the German positions.

The redoubt took its name from the House of Hohenzollern, the Prussian dynasty whose troops held it. The surrounding pit-heads and spoil heaps, known as Fosses and Crassiers, were hollowed out for observation posts and machine-gun nests, and the nearby heap called The Dump, 20 ft high, gave a view in all directions. The site lies at Auchy-les-Mines near Loos-en-Gohelle.

The site is located at 320 Chemin du Mont d'Auchy near several Commonwealth War Cemeteries and the Notre Dame de Lorette Museum. Visitors should wear sturdy footwear as the ground can be muddy or uneven in places.

The fortification still shows traces of British tunneling work and chambers dug beneath the ground for explosives. These underground passages are part of the larger story of mine warfare tactics during the First World War.