Related Rule
Madagascar
Practice Relating to Rule 42. Works and Installations Containing Dangerous Forces
Section B. Placement of military objectives near works and installations containing dangerous forces
Madagascar’s Military Manual (1994) states: “Defences erected for the sole purpose of defending works or installations containing dangerous forces against attack are permissible.” 
Madagascar, Le Droit des Conflits Armés, Ministère des Forces Armées, August 1994, Fiche No. 3-SO, § H.