Related Rule
Belgium
Practice Relating to Rule 58. Improper Use of the White Flag of Truce
Belgium’s Teaching Manual for Officers (1994) states: “It is prohibited to abuse the protective signs provided for by the [1949 Geneva] Conventions and [the 1977 Additional Protocol I]. Example: camouflaging arms and ammunition in a vehicle or a building flying … the white flag.” 
Belgium, Droit de la Guerre, Manuel d’Instruction pour Officiers, Etat-Major Général, Division Opérations, 1994, Part I, Title II, p. 33.
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 … :
30. improper use of the white flag of truce … , when it results in loss of life or serious injury  
Belgium, Penal Code, 1867, as amended on 5 August 2003, Chapter III, Title I bis, Article 136 quater, § 1(30).
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 … :
16 bis improper use of the white flag of truce … , when it results in loss of life or serious injury. 
Belgium, Law relating to the Repression of Grave Breaches of International Humanitarian Law, 1993, as amended on 23 April 2003, Article 1 ter, § 1(16 bis).