When the First World War began, is not so easy to say. Preparations started in 1913 when the Russian Tsar had come in late December its troops from Siberia. But, he did not end the mobilization. Already in the spring of 1914, he sent them to the west. Alliances in different parts of Europe are closed. There are also conspiracies. Europe is a powder keg. On 28 June 1914 the assassination in Sarajevo, which is officially the war began.