Trotsky was again sick and unable to respond while his opponents mobilised all of their resources to denounce him. They succeeded in damaging his military reputation so much that he was forced to resign as People's Commissar of Army and Fleet Affairs and Chairman of the Revolutionary Military Council on 6 January 1925. Zinoviev demanded Trotsky's expulsion from the Communist Party, but Stalin refused to go along and played the role of a moderate. Trotsky kept his Politburo seat, but was effectively put on probation.