Related Rule
Ecuador
Practice Relating to Rule 139. Respect for International Humanitarian Law
Ecuador’s Naval Manual (1989) states:
During wartime or other periods of armed conflict, the rules of engagement reaffirm the right and responsibility of the operational commander to seek out, engage, and destroy enemy forces consistent with … the law of armed conflict. 
Ecuador, Aspectos Importantes del Derecho Internacional Marítimo que Deben Tener Presente los Comandantes de los Buques, Academia de Guerra Naval, 1989, § 5.5.1.