Related Rule
Peru
Practice Relating to Rule 139. Respect for International Humanitarian Law
Section B. Orders and instructions to ensure respect for international humanitarian law
Peru’s IHL and Human Rights Manual (2010) states:
When missions are given to subordinates, they shall be accompanied by the rules of engagement and/or instructions for conduct that is compatible with international humanitarian law (for example, in special situations such as combat between irregular forces or opposition movements). 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 25(a)(11), p. 227.