Serbia
Because serbia didn't want to agree to everything Austria Hungary wanted they invaded serbia which would force Serbia to fight back.
SERBIA
The two countries that invaded France were Astria and Prussia.
No, Montenegro and Serbia are two separated countries.
Austria's government took this very seriously, they invaded France without permission. EDIT: Actually, they issued an ulitmatum to Serbia that if they didn't meet a list of demands, there would be war. France was not represented in this conflict. They were understanably angry and issued an ultimatum for Serbia in retaliation for the Slavic nation's inablitity to keep their citizens from killing political leaders of other countries.
Australiawas not invaded in 1901
There are several countries and a sea between Italy and Serbia.
During ww2 they invaded Austria, Czechoslovakia, Ukraine, Belarus, Lithuania, Latvia, Estonia, soviet union, Egypt, Serbia, Croatia, Slovenia, Bosnia, Greece, Channel Islands, France, Luxembourg, Netherlands, Belgium, Norway, Poland, Denmark, Hungary, Britain and Italy.
Surrounding countries are Ukraine, Hungary, Serbia, Bulgaria and Moldova.
Both countries invaded neighboring countries to expand their territory and influence
Mitchell Bell