At the VII Extraordinary Congress of the Bolshevik Party between March 6 and March 8, 1918, Joffe was re-elected to the Central Committee, but only as a candidate (non-voting) member. He remained in Petrograd when the Soviet government moved to Moscow later in March and worked as a member of the Petrograd Bureau of the Central Committee until he was appointed Soviet representative to Germany in April. He signed the Soviet-German Supplementary Treaty on August 27, 1918. On November 6, 1918, literally days before the Armistice and the German Revolution, the Soviet delegation in Berlin headed by Joffe was expelled from the country on charges of preparing a Communist uprising in Germany. Straight before Joffe left Berlin he rendered Oskar Cohn about 1 million Mark and a 10.5 million Russian ruble mandate for a bank account at Mendelssohn &amp; Co. After the delegation returned to Russia Joffe claimed to have paid this money to the Independent Social Democratic Party of Germany (USPD) to support the revolutionary activities and to purchase weapons. These payments led to the demission of Wilhelm Solf as German minister of Foreign affairs, who refused a further cooperation with the USPD.