Chapter IV : Matériel - Art. 15.
Art. 15. Buildings and ' materiel ' pertaining to fixed establishments shall remain subject to the laws of war, but cannot be diverted from their use so long as they are necessary for the sick and wounded. Commanders of troops engaged in operations, however, may use them, in case of important military necessity, if, before such use, the sick and wounded who are in them have been provided for.