The Austro-Hungarians took belgrade and forced the serbians back behind
Greece
Greece was neutral soo it was seen as a violation of there sovereignty(trust me countries sovereignty is going to get violated alot in world war 1)
Bulgaria seeing its chance to get back land it lost joined the side of the central powers and invaded eastern serbia
now the allies had 3 enemies germany austria hungary and bulgaria
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World War 1 For Dummies
RandomHi im elecelecman And im also a historian Today we'll be looking at world war 1 A war that defined a generation Hopefully by the end of this you'll have a better understanding of this event And its impact on the future
