Related Rule
Belgium
Practice Relating to Rule 28. Medical Units
Belgium’s Law of War Manual (1983) provides: “Medical units and material may not be made the object of attack under any circumstances, even when located near military buildings.” 
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. 48.
Belgium’s Teaching Manual for Soldiers states:
The protection accorded to the wounded would be illusory if the civilian and military medical services which are specifically set up to treat them could be attacked. Hence, medical services, identified by the Red Cross (or Red Crescent in certain countries), are not considered combatants or military objectives even if they wear the enemy uniform or bear its insignia. Enemy medical … establishments and units may not be attacked. 
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. 17; see also p. 8.
The manual further states:
The prohibition to attack hospitals remains applicable even if it is guarded by sentries or its personnel carry light individual weapons for their own defence or for the defence of the wounded in their charge, the establishment or material. In order to ensure that friendly medical units enjoy the same protection, their use in support of combat operations (medical personnel taking part in hostilities, ambulances transporting weapons or combatants, armed troops housed in a hospital, etc.) should be avoided. 
Belgium, Droit de la Guerre, Dossier d’Instruction pour Soldat, à l’attention des officiers instructeurs, JS3, Etat-Major Général, Forces Armées belges, undated, pp. 18–19.
Belgium’s Penal Code (1867), as amended in 2003, provides:
War crimes envisaged in the 1949 [Geneva] Conventions … and in the [1977 Additional Protocols I and II] … , as well as in Article 8(2)(f) of the [1998 ICC Statute], and listed below, … constitute crimes under international law and shall be punished in accordance with the provisions of the present title … :
35. intentionally directing attacks against … medical units [and]… hospitals, provided they are not military objectives. 
Belgium, Penal Code, 1867, as amended on 5 August 2003, Chapter III, Title I bis, Article 136 quater, § 1(15)(35); see also Chapter III, Title I bis, Article 136 quater, § 1(21).
Belgium’s Law relating to the Repression of Grave Breaches of International Humanitarian Law (1993), as amended in 2003, provides:
War crimes envisaged in the 1949 [Geneva] Conventions … and in the [1977 Additional Protocols I and II] … , as well as in Article 8(2)(f) of the [1998 ICC Statute], and listed below, … constitute crimes under international law and shall be punished in accordance with the provisions of the present title … :
21. intentionally directing attacks against … medical units … [and] hospitals, provided they are not military objectives. 
Belgium, Law relating to the Repression of Grave Breaches of International Humanitarian Law, 1993, as amended on 23 April 2003, Article 1 ter, § 1(8 ter)(21); see also Article 1 ter, § 1(11 bis).