In WWI, the Alliance system was so confusing that a small dispute, by international standards at least, in Serbia caused a major conflict. In response to the assassination of the heir to the Austro-Hungarian throne, the Austro-Hungarian empire declared war on Serbia on 28th July.
Russia mobilised in support of the Serbs. In support of Austro-Hungary Germany declared war on Russia as the French mobilised to support Russians. 3 August: Germany declares war on France and then 4 August: Britain declares war on Germany.
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Germany declared war with Russia on 1st of August 1914 & in WW2 on the 22nd June 1941.
August 1th 1914
Germany declared war on Russia
Germany was allied with Austria-Hungary in 1914. Serbia was allied with Russia, and Russia was a member of the Triple Entente with France and Britain. When Austria declared war on Serbia after the assassination of Archduke Franz Ferdinand in Sarajevo. Russia declared war on Austria. Germany then declared war on Russia and subsequently on France and Britain.
Yes after Russia declared war on Austro-Hungary. (Germany's ally)