Volume  1. The great explosion : backgrounds and origins of the World WarVolume  2. How the war was lost and won : the grand strategy of the high commandsVolume 3. Battles, sieges and campaigns : the military achievements of the warVolume  4 The war at sea : battles, sea raids and submarine campaignsVolume  5. The United States in the war : the American armies abroad and at homeVolume  6. The world at war : revolutions and social changes in thirty-six landsVolume  7. The armies of mercy : the vast relief work in all the nationsVolume  8. Inventive and industrial triumphs : science and industry in the struggleVolume  9. War makers and peace makers : character studies of the leading actors in the conflict