The First World War started with the Austro-Hungarian invasion of Serbia. The Austrians, ill equipped and fighting in unknown territory suffered a humiliating defeat at the hand of the Serbs in the first months of the war. A year later, a combined German, Austrian and Bulgarian attack was launched and the weak Serbian army could not stand against such overwhelming odds. The Serbian army was evacuated to Greece, were they would take part in the Salonika campaign. Serbia itself was under occupation until the defeat of the Central Powers in 1918.