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Belgium
Practice Relating to Rule 65. Perfidy
Section A. General
Belgium’s Law of War Manual (1983) states: “Perfidious acts are acts which abuse the confidence of the adversary so that he thinks he is facing a friend or a situation protected by the law of war.” 
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. 32.
Belgium’s Teaching Manual for Officers (1994) provides that acts of perfidy are prohibited. It describes perfidy as “ruses aimed at neutralizing the enemy (capturing, injuring or killing him) by leading him to believe that he has an obligation to respect a rule of humanitarian law”. 
Belgium, Droit de la Guerre, Manuel d’Instruction pour Officiers, Etat-Major Général, Division Opérations, 1994, Part I, Title II, p. 34.
Belgium’s Teaching Manual for Soldiers defines perfidy as “any act intended to deceive or abuse the enemy’s confidence by inviting him to afford humanitarian protection and to respect a humanitarian rule”. 
Belgium, Droit de la Guerre, Dossier d’Instruction pour Soldat, à l’attention des officiers instructeurs, JS3, Etat-Major Général, Forces Armées belges, undated, p. 19, footnote (1).