Related Rule
Practice Relating to Rule 53. Starvation as a Method of Warfare
Section B. Sieges that cause starvation
Argentina’s Law of War Manual (1969), in a chapter dealing, inter alia, with siege warfare, provides: “Belligerent forces must try and conclude agreements which facilitate … the free passage of … essential foodstuffs and clothing.” 
Argentina, Leyes de Guerra, RC-46-1, Público, II Edición 1969, Ejército Argentino, Edición original aprobado por el Comandante en Jefe del Ejército, 9 May 1967, § 1.014.