With the Vardar Offensive and the success of Allied forces at the Battle of Dobro Pole, Bulgaria capitulated and signed the Armistice of Salonica on 29 September 1918. New Austro-Hungarian and German troops redeployed to Serbia from Ukraine were unable to halt the northward advance of the Royal Serbian Army. By the third week of October, General Hermann von Kövess ordered a strategic retreat behind the Danube, Sava and Drina rivers. On 29 October, Governor-General von Rhemen and his staff left occupied Serbia. The following day, Belgrade was liberated by the Royal Serbian Army. By 1 November, all of pre-war Serbia had been liberated, bringing the three-year Central Powers occupation to an end.