Kammala jumla mai zuwa: Bayan shiga Bulgaria a Yaƙin Duniya na Farko, ya umurci rundunar soja ta 2. Ya jagoranci ayyukan a Makidoniya wanda ya ƙare tare da shan kashi na Serbs a yakin Ovche Pole. Tare da wannan nasarar, 'yan Bulgarian ba su ba da damar ganawar sojojin Serbia da sojojin Anglo-Faransa da suka shiga cikin Solun ba. A watan Fabrairun 1917, ya jagoranci rundunar soja ta 3 kuma ya ci Romaniya a Dobrudzha. Daga 8 ga Satumba 1918, ya zama babban kwamandan sojojin Bulgaria bayan rashin lafiyar Janar Nikola Zhekov. Ya shiga cikin
Yaƙin Dobro Pole, wanda shine babban nasarar Serbia a 1918. An sallame shi a shekara ta 1919.