On 14 April, Stroop met Himmler in his private train near Prenzlau. With a pass signed by Himmler, Stroop traveled to the Alpine Redoubt with a group of teenaged Hitler Youth members he was training for war. To obtain gasoline and other scarce supplies, Stroop showed Himmler's signed order and claimed to be transporting his Werwolf unit to build an Alpine bastion for the salvation of the Reich.