World War I (First World War or Great War o WWI) started on July 28, 1914 and ended on November 11, 1918, was a war focused in Europe. The war divided two nations: the Allies consisting of Russian Empire, France, Italy, Japan and United Kingdom or British Empire against the Central powers consisting of Germany, Ottoman Empire and Austria-Hungary. The war, introducing new military technology weapons, had killed an estimation of nine million soldiers in annihilation, bloodshed and massacre. Technology weapons such as Tank Corps, Vickers gun (British invention) and Lewis gun (American-invented), aeroplanes, poison gas and cellucotton.