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Austria declared war on Serbia because Serbian Gavrilo Princip had assassinated the archduke Franz Ferdinand and his wife in Austria in 1914. The war was declared on Serbia. Russia responded by aiding Serbia. Then Germany sent ultimatum to Russia demanding Russia to stop mobilizing and once the ultimatum was rejected by the Russians, Germany declared war on Russia.
Mobilized its military because of its alliance with Serbia.
Archduke Franz Ferdinand was assassinated in Sarajevo by a Serbian nationalist named Gavrilo Princip. Austria-Hungary blamed the Serbians and sent Serbia an ultimatum with an impossible list of demands. Serbia refused these demands, and Austria-Hungary declared war. When Austria-Hungary declared war on Serbia, Russia got involved to defend Serbia. Germany, seeing that Russia was mobilizing, declared war on Russia. France was then drawn in against Germany and Austria-Hungary. Germany attacked France by marching through Belgium pulling Britain into war. Then Japan entered the war to support its British allies.
Military Ordinariate of Austria was created in 1773.
austria declared war on Serbia in 1914
After the Austro-Hungary monarchy declared war on Serbia, France and Russia who were protecting Serbia declared war on Austria-Hungary. and then Germany declared war on Russia and France, then UK declared war on Germany...
Austria Hungary declared war on Serbia.
Serbia
the alliance systems are one of the main causes that the war spread to so many countries. the war was originally between Austria-Hungary and Serbia. But, Russia was allied with Serbia so they began mobilizing for war. Germany was allied with Austria-Hungary so they declared war on Russia. Germany later declared war on France. To get to France, Germany went through Belgium. Belgium was allied with Britain so Britain declared war on Germany. this continued until many more countries became involved.
Austria-Hungary, declared war on Serbia
Austria-Hungary's future king was assassinated.
Austria-Hungary declared war on Serbia at the start of World War I.