To the Nazi leadership it was clear that the battle for Berlin, which started in late April, would be the final battle of the war. On 27 April 1945, Högl was sent out to find Himmler's liaison man, SS-"Gruppenführer" Hermann Fegelein who had deserted his post at the "Führerbunker". Fegelein was caught by Högl's RSD squad in his Berlin apartment, wearing civilian clothes and preparing to flee to Sweden or Switzerland. He was carrying cash—German and foreign—and jewellery, some of which belonged to Eva Braun. Högl also uncovered a briefcase containing documents with evidence of Himmler's attempted peace negotiations with the western Allies. Fegelein was brought back to the "Führerbunker" and then shot on 28 April. After Hitler committed suicide on 30 April, Rattenhuber and the remaining RSD officers were taken prisoner by the Soviet Red Army on 1 May 1945 during the attempted break-out to avoid capture from central Berlin. After the war, Rattenhuber served 10 years in prison before being released by the Soviets on 10 October 1955.