Related Rule
Practice Relating to Rule 65. Perfidy
Section E. Simulation of an intention to negotiate under the white flag of truce
Indonesia’s Military Manual (1982) provides: “It is prohibited to kill or injure the enemy by perfidy, such as … to misuse the flag of truce.” 
Indonesia, The Basics of International Humanitarian Law, Legal Division of the Indonesian Armed Forces, 1982, § 103.