The Russian Empire's entry into World War I unfolded gradually in the days leading up to July 28, 1914. The sequence of events began with Austria-Hungary's declaration of war on Serbia, a Russian ally
Russian troops in the trenches at the Russian invasion of East Prussia.
A Russian recruiting poster. Caption reads: "World on Fire; Second Patriotic War."
Nicky (Tsar Nicholas II) (right) with Willy (Kaiser Wilhelm) in 1905. Nicholas is wearing a German Army uniform, and Wilhelm is wearing that of a Russian hussar regiment.
Russian prisoners at the Battle of Tannenberg where German forces annihilated the Russian Second Army.
Identifying the causes of World War I remains a debated issue. World War I began in the Balkans on 28 July 1914, and hostilities ended on 11 November 1918, leaving 17 million dead and 25 million wound
Grave implications of the assassination were immediately recognized, as in this 29 June article with subtitles "War Sequel?" and "War May Result", and stating the assassination was "engineered by persons having a more mature organizing ability than that of the youthful assassins".
American cartoon showing territorial dispute between France and Germany over Alsace-Lorraine, 1898
French troops in Morocco, 1912
The Anglo-German naval arms race became a considerable source of tension between Germany and Britain prior to World War I. Royal Navy warships pictured above in battle formation.