Kammala jumla mai zuwa: Bayan nasarar sojojin Serbia a cikin
Yaƙin Kolubara a watan Disamba na 1914, gaban Serbia ya ga kwanciyar hankali har zuwa farkon kaka na 1915. A karkashin jagorancin Field Marshal August von Mackensen, sojojin Balkan na Austro-Hungary, sojojin Jamus na 11 da kogin kogin a kan Danube da Sava sun fara kai hari a ranar 6 ga Oktoba, 1915, mafi girman kai hari kan Serbia. A watan Satumbar 1915, duk da tsananin sadaukar da sojojin Serbia, Sojojin Balkan na Austro-Hungary, bayan sun tsallaka kogin Sava da Drina da rundunar sojojin Jamus ta 11 bayan sun tsallaka Danube, sun mamaye Belgrade, Smederevo, Požarevac da Golubac, suna samar da babbar gada a kudu da kogin Sava da Danube, kuma sun tilasta sojojin Serbia su janye zuwa kudancin Serbia.