According to this page: http://en.wikipedia.org/wiki/World_War_I this was the chronology of World War I:
Confusion among the central powers: because of the lack of communications Austria-Hungary and Germany suffered misunderstandings. Germany said that he would support Austria-Hungary but A-H misundertood that promise, so he invaded Serbia but Gemrany was busy so he had to divide the army and gained Russia as an enemy.
African Campaigns: Britain, France and Germany had colonies in Africa. British and French colonies, faught with the British and French troops against the German colonies in Africa untill the war ended.
Serbian Campaign: Serbians had to defend from the Austrian attacks. They occupided defensive positions in south Drina and Sana. Austrians threw back with big losses and had to deal with the angry Russians.
