“On September 17, 1914, Erzberger, the well-known German statesman, an eminent member of the Catholic Party, wrote to the Minister of War, General von Falkenhayn, We must not worry about committing an offence against the rights of nations nor about violating the laws of humanity. Such feelings today are of secondary importance? A month later, on October 21, 1914, he wrote in Der Tag, If a way was found of entirely wiping out the whole of London it would be more humane to employ it than to allow the blood of A SINGLE GERMAN SOLDIER to be shed on the battlefield!”
Source : "Grandeur and Misery of Victory". Book by Georges Clemenceau, trans. F. M. Atkinson, p. 279 (quoting Matthias Erzberger), 1930.
