The 1956 printing. The purpose of this Manual is to provide authoritative guidance to military personnel on the customary and treaty law applicable to the conduct of warfare on land and to relationships between belligerents and neutral States. Although certain of the legal principles set forth herein have application to warfare at sea and in the air as well as to hostilities on land, this Manual otherwise concerns itself with the rules peculiar to naval and aerial warfare only to the extent that such rules have some direct bearing on the activities of land forces.