On 20 July, Guderian withdrew to his Deipenhof estate and could not be contacted by the resistance.[28][29] According to Goda, when it became clear that Hitler was still alive, Guderian ordered the Panzer units in Berlin to be loyal to the regime, and then sat on the Court of Honor that had the responsibility of expelling officers involved in it so that they could be tried before the Volksgerichtshof, a duty that he performed with zeal.[30] It was only after January 1945, when Guderian's estate fell behind Soviet lines, that he began to disagree openly once more with Hitler. These disagreements were so intense that Hitler fired Guderian as Chief of the General Staff in March 1945.[31]