Photo story (Clockwise from top le f t): (1) British site after un-reckoned German phosgene (probably) gas attack at Fromelles, France during WWI (2) A British gas bomb in 1915 (3) A Canadian soldier with burns caused by mustard gas during 1917-18 (4) British infantry advancing through chemical weapons attacks and gas clouds at Loos, France on 25 th September 1915 The Great War or World War I that lasted from 28 th July 1914 to 11 th November 1918 (though it’s Armistice, the last treaty, Treaty of Sevres, was signed on 10 th August 1920) was one of the largest wars in the history with 70 million soldiers including 60 million European military personnel were mobilized. The resurgence of Neocolonialism or imperialism was the root cause of WWI. The conflict began between Austro-Hungaria and Serbia while the former fired the first shots in preparation for the invasion of Serbia. Soon Russia mobilized and Germany invaded neutral Luxembourg and Belgium and further moved