To this end, it participated in the First World War on the side of the Central Powers, since its Balkan enemies (Serbia, Montenegro, Greece, and Romania) were pro-Entente (see articles on the Serbian Campaign and the Macedonian Front of World War I).
Seepärast osales ta Esimeses maailmasõjas Keskriikide poolel, kuna tema Balkani vaenlased (Serbia, Montenegro, Kreeka ja Rumeenia) olid Antanti-meelsed (vaata Serbia kampaania (Esimene maailmasõda) ja Makedoonia rinne).