Chapter 16. Genocide, crimes against humanity and war crimes
Section 106. War crimes consisting in the use of prohibited methods of warfare
Any person is liable to punishment for a war crime who in connection with an armed conflict
(g) leading any person to believe that he is entitled to protection or is obliged to provide protection in accordance with international law and with the intention of betraying this trust, kills or wounds any person belonging to the nationals or armed forces of the hostile party, or
Killing or wounding a combatant who has laid down his arms and surrendered at discretion - IAC
Killing or wounding a combatant who no longer has means of defence and has surrendered at discretion - IAC
EDIT.