ICRC databases on international humanitarian law
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1949 Conventions and Additional Protocols, and their Commentaries
Historical Treaties and Documents
The Laws of War on Land. Oxford, 9 September 1880.
Part II : Application of general principles #I. Hostilities #A. Rules of conduct with regard to individuals #(c) The sick and wounded, and the sanitary service - Art. 15.
Art. 15. When such personnel requests to withdraw, the commander of the occupying troops sets the time of departure, which however he can only delay for a short time in case of military necessity.