In January 1945, Rattenhuber accompanied Hitler and his entourage into the bunker complex under the Reich Chancellery garden in the central government sector of Berlin. Rattenhuber was promoted in rank to SS-"Gruppenführer" on 24 February 1945. On 28 April, when it was discovered that Heinrich Himmler was trying to negotiate a backdoor surrender to the Western Allies via Count Folke Bernadotte, Rattenhuber became part of a military tribunal ordered by Hitler to court-martial Himmler's SS liaison officer Hermann Fegelein. Fegelein, by that time was Eva Braun's brother-in-law. Wilhelm Mohnke presided over the tribunal which, in addition to Rattenhuber and Mohnke, included Generals Hans Krebs and Wilhelm Burgdorf. However, Fegelein was so drunk that he was crying, vomiting and unable to stand up; he even urinated on the floor. It was the opinion of the judges that he was in no condition to stand trial. Therefore, Mohnke closed the proceedings and turned Fegelein over to the RSD security squad.