Related Rule
United Kingdom of Great Britain and Northern Ireland
Practice Relating to Rule 150. Reparation
Section A. General
The UK LOAC Manual (2004) states:
It is a principle of international law that a state responsible for an internationally wrongful act is obliged to make full reparation for the injury caused by that act. This principle extends to the law of armed conflict in that a state is responsible for violations of the law committed by persons forming part of its armed forces and, if the case demands, is liable to pay compensation. 
United Kingdom, The Manual of the Law of Armed Conflict, Ministry of Defence, 1 July 2004, § 16.15.