 On 30 July, Russia declared general mobilisation in support of Serbia; on 1 August, Germany declared war on Russia, followed by Austria-Hungary on 6th.Russia and the Entente declared war on the Ottoman Empire in November 1914, after Ottoman warships bombarded the Black Sea port of Odessa in late October.Unlike its Allies, Russia's Empire was one contiguous landmass but it also considered itself the defender of its fellow Slavs in countries like Serbia.