After the Red Army broke through the Tannenberg Line in Eastern Estonia and crossed the Emajõgi river near Tartu, it launched the Tallinn Offensive on 17 September 1944 when Adolf Hitler had agreed to start abandoning Estonia on 16 September 1944. The National Committee of the Republic of Estonia was formed in Tallinn in March 1944 and the last Prime Minister of Estonia Jüri Uluots organized a new government under Otto Tief on 18 September 1944, captured government offices in Tallinn on 20 September 1944, and put the Estonian flag on top of the Pikk Hermann Tower.