Vardar Offensive

The Vardar Offensive took place between 14 and 29 September 1918 and was the last major military operation on the Macedonian Front during the First World War. Following intensive preparations, the multinational Allied armies broke the deadlock that had persisted in this sector for several years and successfully hastened the capitulation of the Kingdom of Bulgaria. This changed the strategic and operational balance of the war against the Central Powers.

The battle resulted in Bulgaria's capitulation. Amid these chaotic circumstances, a Bulgarian delegation arrived in Thessaloniki to request an armistice. On 29 September, the Bulgarians received the Armistice of Salonica from General d'Espèrey. Bulgaria's collapse changed the strategic and operational balance of the war against the Central Powers. Hostilities on the Macedonian Front ended at noon on 30 September, when the armistice came into force. The agreement included the complete surrender of the German Eleventh Army, bringing the total number of German and Bulgarian prisoners to 77,000 and giving the Allies 500 artillery pieces. The Radomir Uprising was suppressed by Bulgarian forces on 2 October, while Tsar Ferdinand I of Bulgaria abdicated and went into exile the following day.