Article 1 Code of Crimes against International Law (CCAIL)
Part 2 Crimes against International Law
Chapter 2 War crimes
Section 11 War crimes consisting in the use of prohibited methods of warfare
(1) Whoever in connection with an international armed conflict or with an armed conflict not of an international character,
6. orders or threatens, as a commander, that no quarter will be given,
shall be punished with imprisonment for not less than three years. In less serious cases under number 2 the punishment shall be imprisonment for not less than one year.
Denial of quarter - IAC
Denial of quarter - NIAC
EDIT.