Interesting analysis of the Ba'athists guerrilla campaign from a company that sells this sort of analysis. The writer says it took a while for the Americans to identify their enemy's weak spot - money.
The guerrillas did have one major vulnerability: money. The Baathist regime long ago lost its ideological -- and idealistic -- foundations. It was an institution of self-interest in which the leadership systematically enriched itself.
The Americans are able to outspend the Ba'athists and can afford to pay people to betray the guerrillas.