<prompt> Bhala ukuqhubeka kwalesi sigaba - Ngemva kokunqoba kwebutho laseSerbia eMpini yaseKolubara  <response>: ngo-December 1914, impi yaseSerbia yaphela kwaze kwaba sekuqaleni kwekwindla lika-1915. Ngaphansi komyalo kaField Marshal August von Mackensen, i-Austro-Hungarian Balkan Army, i-German 11th Army kanye nemifula emifuleni eDanube naseSava yaqala ukuhlasela ngo-Okthoba 6, 1915, ukuhlasela okukhulu kakhulu ngokumelene neSerbia. NgoSepthemba 1915, naphezu kokuzidela okukhulu kwebutho laseSerbia, i-Austro-Hungarian Balkan Army, ngemuva kokuwela imifula iSava neDrina kanye ne-German 11th Army ngemuva kokuwela iDanube, bathatha iBelgrade, iSmederevo, iPožarevac neGolubac, bakha ibhuloho elibanzi eningizimu yemifula iSava neDanube. Lokhu, kuhlanganiswe nokuhlasela okuphumelelayo kwamaBulgaria eMorava, Ovče Pole naseKosovo kwaphoqa amabutho aseSerbia ukuba ahoxele eGrisi engathathi hlangothi. IFrance neBrithani zathumela amabutho avela eMkhankasweni WaseGallipoli eGrisi eMakedoniya. Ngakho-ke kwasungulwa umngcele waseMacedonia ngomzamo wokusekela izinsalela zempi yaseSerbia ukunqoba iVardar Macedonia. 