The guerrillas have widespread popular support in the Sunni Arab areas of Iraq, an area with some 4 million persons. Its cities and deserts offer plenty of cover for an unconventional war. Guerrilla movements can succeed if more than 40 percent of the local population supports them. While the guerrillas are a small proportion of Iraqis, they are very popular in the Sunni Arab areas. If you look at it as a regional war, they probably have 80 percent support in their region.
The guerrillas are mainly Iraqi Sunnis with an intelligence or military background, who know where secret weapons depots are containing some 250,000 tons of missing munitions, and who know how to use military strategy and tactics to good effect. They are well-funded and can easily get further funding from Gulf millionnaires any time they like.
The Iraqi guerrillas are given tactical support by foreign jihadi fighters. There are probably only a few hundred of them, but they are disproportionately willing to undertake very dangerous attacks, and to volunteer as suicide bombers.
There are simply too few US troops to fight the guerrillas. There are only about 70,000 US fighting troops in Iraq, they don’t have that much person-power superiority over the guerrillas. There are only 10,000 US troops for all of Anbar province, a center of the guerrilla movement with a population of 820,000. A high Iraqi official estimated that there are 40,000 active guerrillas and another 80,000 close supporters of them. The only real explanation for the successes of the guerrillas is that the US military has been consistently underestimating their numbers and abilities. There is no prospect of increasing the number of US troops in Iraq.
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The guerrilla tactic of fomenting civil war among Iraq’s ethnic communities, which met resistance for the first two years, is now bearing fruit. There is increasing evidence of Shiite murders of Sunni clerics and worshippers, and of Sunni attacks on Shiites, beyond the artificial efforts of the guerrillas themselves. Civil war and turbulence benefit the guerrillas, who gain cover for violent attacks, and who can offer themselves to the Iraqis as the only force capable of keeping order. AP reports an Iraqi official saying today that there is a civil war going on in the northern city of Telafar between Sunnis and Shiites. I doubt US television news is even mentioning it.
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Therefore, I conclude that the United States is stuck in Iraq for the medium term, and perhaps for the long term. The guerrilla war is likely to go on a decade to 15 years. Given the basic facts, of capable, trained and numerous guerrillas, public support for them from Sunnis, access to funding and munitions, increasing civil turmoil, and a relatively small and culturally poorly equipped US military force opposing them, led by a poorly informed and strategically clueless commander-in-chief who has made himself internationally unpopular, there is no near-term solution.
In the long run, say 15 years, the Iraqi Sunnis will probably do as the Lebanese Maronites did, and finally admit that they just cannot remain in control of the country and will have to compromise. That is, if there is still an Iraq at that point.