Related Rule
Practice Relating to Rule 15. The Principle of Precautions in Attack
Section A. Constant care to spare the civilian population, civilians and civilian objects
Ecuador’s Naval Manual (1989) states: “All reasonable precautions must be taken to ensure that only military objectives are targeted so that civilians and civilian objects are spared as much as possible from the ravages of war”. 
Ecuador, Aspectos Importantes del Derecho Internacional Marítimo que Deben Tener Presente los Comandantes de los Buques, Academia de Guerra Naval, 1989, § 8.1.