King Peter I of Bulgaria abandons his car for a mule at the war front, World War One. 1915. Peter I (1844 - 1921) reigned as the last king of Serbia (1903-1918) and as the first king of the Serbs, Croats and Slovenes (1918-1921).

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Photo credit: © World History Archive / Alamy / Afripics
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Keywords: ., abandons, bulgaria, car, croats, europe, front, king, liberator, military, mule, peter, serbia, serbian, serbs, slovenes, war, world