I remember it starting very early like within 2-3 weeks (maybe 1 month) when the Iraqis hung those contractors from the bridge in Bagdad, I think it started before Saddam was captures (2-3 months later)... yep I was right... Invasion March 20th, Saddam captured Dec 14th... > 8 months later. Insurgency started long before that.
But it is hard to remember exact timelines 10 years later.
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David (OFI)