irregular warfare
Civilian casualty ratio
endemic warfare
Fourth-generation warfare
Hague Conventions
(1899 and 1907)
Information warfare
Irregular military
Low-intensity conflict
Political warfare
Psychological operations
Small Wars Journal
The Troubles
War on terror
War on drugs
Individuals:
Che Guevara
François Géré
John R. M. Taylor
T. E. Lawrence
Robert Rogers' 28 "Rules of Ranging"
https://en.wikipedia.org/wiki/Irregular_warfare