The First World War which commenced in 1914 and lasted for four years and three months, was different from the wars fought in earlier period of human history, in so far as it was fought on world- wide scale and had its repercussions on practically all the countries of the world. During this war the various States parties to war made use of modern technology and tried to find new methods of destruction and defence. This also different from earlier wars in so far it was not fought by the armies, navies and air force alone but by the people as a whole. Above all, as Prof. David Thomson has observed, the greatest novelty of this war was “remarkable disparity between the ends sought, the prices paid and the results ob­tained.”