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. Wannan, haɗe tare da nasarar nasarar Bulgarian a Morava, Ovče Pole da Kosovo sun tilasta sojojin Serbia su janye zuwa Girka mai tsaka tsaki. Faransa da Birtaniya sun tura dakarun daga Kamfen na Gallipoli zuwa Girka Macedonia. Don haka an kafa gaban Macedonia a cikin ƙoƙari don tallafawa ragowar sojojin Serbia don cin nasarar Vardar Macedonia.