Règle correspondante
Belgium
Practice Relating to Rule 1. The Principle of Distinction between Civilians and Combatants
Section A. The principle of distinction
Belgium’s Law of War Manual (1983) provides: “A distinction must always be made between the civilian population and those participating in hostilities: the latter may be attacked, the former may not.” 
Belgium, Droit Pénal et Disciplinaire Militaire et Droit de la Guerre, Deuxième Partie, Droit de la Guerre, Ecole Royale Militaire, par J. Maes, Chargé de cours, Avocat-général près la Cour Militaire, D/1983/1187/029, 1983, p. 26.
A report submitted to the Belgian Senate in 1991 noted that the principle of distinction remained the foundation of the law of armed conflict. 
Belgium, Senate, Report, Enquête parlementaire sur l’existence en Belgique d’un réseau de renseignements clandestin international, 1990–1991 Session, Doc. 1117-4, 1 October 1991, § 20.