Serbian campaign of World War I
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The Serbian campaign was a series of military expeditions launched in 1914 and 1915 by the Central Powers against the Kingdom of Serbia during the First World War.
The first campaign began after Austria-Hungary declared war on Serbia on 28 July... Wikipedia
Dates: Jul 28, 1914 – Nov 13, 1918
Location: Austria-Hungary, Kingdom of Serbia, Kingdom of Montenegro, and more