一战期间，巴尔干分成两个阵营：塞尔维亚在三国协约一方作战，而保加利亚和土耳其则与中央列强结盟。
During the first world war , the Balkans was divided into two camps : serbia was fighting on the side of the Triple Entente against Bulgaria and turkey , which were in coalition with the central powers .
三国协约