In 1938 and 1939, the German army became interested in the Hunsrück region as a strategic deployment route to the German-French border and the Siegfried Line, building the Hunsrück Highway, 140 kilometres long, in just 100 days. Supply depots and airfields were built in the woods on both sides of the road. In the Second World War and post-war period, two places in the Hunsrück rose to notoriety: Hinzert concentration camp and Bretzenheim POW camp, the so-called Field of Misery.