Related Rule
Practice Relating to Rule 139. Respect for International Humanitarian Law
Section B. Orders and instructions to ensure respect for international humanitarian law
France’s LOAC Manual (2001) defines rules of engagement as “instructions established by the competent political or military authority to determine the circumstances of and the limitations to the use of force by the armed forces when, confronted with other forces, they undertake or continue armed engagement”. 
France, Manuel de droit des conflits armés, Ministère de la Défense, Direction des Affaires Juridiques, Sous-Direction du droit international humanitaire et du droit européen, Bureau du droit des conflits armés, 2001, p. 107.
The instructions given to the French armed forces for the conduct of Opération Mistral, simulating a military operation under the right of self-defence or a mandate of the UN Security Council, in a part dealing with the “eight fundamental rules of international humanitarian law”, state: “The parties to the conflict shall give the necessary orders and instructions in order to insure the respect of these rules and will supervise the execution thereof.” 
France, Etat-major de la Force d’Action Rapide, Ordres pour l’Opération Mistral, 1995, Section 6, § 67.