http://www.marines.mil/news/publicat...%20Warfare.pdf

On Guerrilla Warfare by Mao Tse-tung is worth a PhD in COIN simply in the reading of Captain (1940) and Brigadier General retired (1961) Samuel B. Griffith's outstanding introductions.

So many passages from both his lengthy introduction and Mao's base work jumped out at me with special meaning for today.

Regarding the dichotomy I see in the Taliban movement in Afghanistan, that I have frequently described as having two tiers, an upper tier revolutionary movement among the leadership taking sanctuary in Pakistan, and a lower tier resistance movement among the rank and file fighters in Afghanistan:

"THE FUNDAMENTAL DIFFERENCE between patriotic
partisan resistance and revolutionary guerrilla
movements is that the first usually lacks the ideological
content that always distinguishes the second.
A resistance is characterized by the quality of spontaneity;
it begins and then is organized. A revolutionary
guerrilla movement is organized and then begins.
A resistance is rarely liquidated and terminates when
the invader is ejected; a revolutionary movement terminates
only when it has succeeded in displacing the incumbent
government or is liquidated.
Historical experience suggests that there is very little
hope of destroying a revolutionary guerrilla movement
after it has survived the first phase and has acquired the
sympathetic support of a significant segment of the population.
The size of this "significant segment" will vary; a
decisive figure might range from 15 to 25 per cent.
in addition to an appealing program and popular support,
such factors as terrain; communications; the quality
of the opposing leadership; the presence or absence of
material help, technical aid, advisers, or "volunteers" from
outside sources; the availability of a sanctuary; the relative
military efficiency and the political flexibility of the incumbent
government are naturally relevant to the ability of a
movement to survive and expand."