Prologue : what we have forgotten -- Belgian neutrality -- The "Belgian atrocities" and the laws of war on land -- Occupation and the treatment of enemy civilians 191-279 -- Great Britain and the blockade -- Breaking and making international law : the blockade, 1915-1918 -- Germany and new weapons : the submarine, zeppelin, poison gas, flame thrower -- Unrestricted submarine warfare -- Reprisals : prisoners of war and allied aerial bombardment -- Conclusion.