Related Rule
South Africa
Practice Relating to Rule 145. Reprisals
Section A. Definition and purpose of reprisals
South Africa’s LOAC Manual (1996) states:
A reprisal is an otherwise illegal act in response to a prior illegal act by the enemy. The purpose of a reprisal is to get the enemy to adhere to the law of war. Reprisals are only permitted according to strict criteria. 
South Africa, Presentation on the South African Approach to International Humanitarian Law, Appendix A, Chapter 4: International Humanitarian Law (The Law of Armed Conflict), National Defence Force, 1996, § 34(e).
[emphasis in original]
South Africa’s Revised Civic Education Manual (2004) states:
A reprisal is an otherwise illegal act in response to a prior illegal act by the enemy. The purpose of a reprisal is to get the enemy to adhere to the law of war. Reprisals are only permitted according to strict criteria. 
South Africa, Revised Civic Education Manual, South African National Defence Force, 2004, Chapter 4, § 56(e).
[emphasis in original]