During the Second World War, Schwyz was generally insulated from the effects of the war. Several fortresses were built on the Rigi, in the Sattel Pass and on the Etzel and the Linth plains as part of the National Redoubt fortifications. During the war, Schwyz was twice the center of national attention. Once in 1941 on the occasion of the 650th anniversary of Confederation and in 1942, with the arrest of the owner of a dairy and mill for the extensive black market operations.