Related Rule
Zimbabwe
Practice Relating to Rule 7. The Principle of Distinction between Civilian Objects and Military Objectives
Section A. The principle of distinction
The Report on the Practice of Zimbabwe refers to the principle of distinction as set forth in Article 52 of the 1977 Additional Protocol I and states that this principle can undoubtedly be regarded as a customary rule of IHL. The report also points out that the distinction between civilian and military objectives is more problematic in non-international armed conflicts, as guerrillas tend to mingle with the civilian population and civilian facilities, rendering the principle difficult to implement. 
Report on the Practice of Zimbabwe, 1998, Chapter 1.3.