World War I or the First World War , frequently abbreviated as WWI or WW1, was an international war coming from Europe that lasted from 28 July 1914 to 11 November 1918. Contemporaneously understood as the Great War, the World War, and also the war to end all battles, it caused the mobilisation of even more than 70 million army personnel, consisting of 60 million Europeans, making it one of the largest battles in history, as well as additionally one of the deadliest problems in history, with an estimated 8.5 million combatant deaths and 13 million private deaths as a direct outcome of the war. Resulting genocides and the relevant 1918 Spanish influenza pandemic caused another 17-- 100 million fatalities worldwide, consisting of an approximated 2.64 million Spanish flu deaths in Europe and as numerous as 675,000 in the United States.On 28 June 1914, Gavrilo Princip, a Bosnian Serb Yugoslav nationalist and also member of the Serbian Black Hand military society, assassinated the Austro-H...