Rubuta ci gaba don wannan sakin layi - Sakamakon yaƙe-yaƙe na Balkan ya haifar da jin daɗin sake dawowa sosai tsakanin 'yan Bulgaria. A cikin 1915 Jamus ta yi alƙawarin dawo da iyakokin bisa ga Yarjejeniyar San Stefano da Bulgaria, waɗanda ke da babbar rundunar soji a cikin Balkans, sun yi yaƙi da Serbia a watan Oktoba na wannan shekarar. A cikin Yaƙin Duniya na Farko Bulgaria ta tabbatar da ikonta na soja. Yaƙin Doiran na Biyu, tare da janar Vladimir Vazov a matsayin kwamandan, ya yi mummunan rauni a kan Sojojin Burtaniya masu rinjaye, waɗanda suka yi asarar rayuka 12,000 a kan dubu biyu daga gefen da ke gaba. Shekara guda bayan haka, a lokacin Yaƙin Doiran na Uku, Burtaniya, wanda Girka ta goyi baya, ta sake shan wahala mai banƙyama, ta rasa mutane 3,155 a kan kusan ɗari biyar ga bangaren Bulgaria. Sunan sojojin Faransa ya sha wahala sosai. Yaƙin Red Wall ya kasance tare da cin nasarar sojojin Faransa gaba ɗaya, tare da 5,700 daga cikin mutane dubu shida da aka kashe. Sojojin Bulgaria sun kama Faransawa 261 da suka tsira. Daga cikin mutane miliyan 4.5, Bulgaria tana da mutane 1,200,000 a cikin rundunarta. Ko da wannan babban fadada na soja ba zai iya ceton Bulgaria daga rashin nasara na mai kula da ita Jamus ba. Ƙungiyar Allied ta ci gaba a Dobro Pole
kuma sojojin da suka biyo baya a Vladaya sun rushe yakin basasa a 1918. Bulgaria ta mika wuya ba da daɗewa ba bayan waɗannan abubuwan. Wadanda aka kashe a Bulgaria sun kai 412,000, tare da 'yan gudun hijirar 253,000 da aka halicce su daga yankunan da aka rasa.