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Treaty relating to the Use of Submarines and Noxious Gases in Warfare. Washington, 6 February 1922.
Art. 4. The Signatory Powers recognize the practical impossibility of using submarines as commerce destroyers without violating, as they were violated in the recent war of 1914-1918, the requirements universally accepted by civilized nations for the protection of the lives of neutrals and noncombatants, and to the end that the prohibition of the use of submarines as commerce destroyers shall be universally accepted as a part of the law of nations, they now accept that prohibition as henceforth binding as between themselves and they invite all other nations to adhere thereto.