I am afraid it isn’t so simple. You have to keep you face. The Russian did that very well in Afghanistan, parades, flowers and small flags, and immediately after the last tank, they blocked the bridge. The USA in Vietnam was less successful, even if the US didn’t lost the war, of course. Nor the Russians did, by the way… It is still time for the retreat in dignity (soviet option). I just hope that this time, all the decorum felt and a real politic will be engaged to resolve the mess done by this stupid and ill-prepared invasion.
Now, solutions: how tempting for a French, to give lessons…
Negotiate with the local terrorists. Well, difficult to swallow, but inevitable. Give back to the Iraqis the spoils of the war. Anyway, the future Iraqi Government will annulated all the contracts which were given to the US companies. Better to do like if you want to do it.
Stop importing mercenaries called security guards, employ locals. Create local markets, develop the schools, and stop torturing people and bombing wedding party. Stop using shell with phosphorus, even if it isn’t illegal, it bad for the image.
Put police instead of army. Not immediately, but RESOLVE things.
Stop to thing “we have the bigger guns so we will win”. Ho Chi Minh told us, French and American, was is a Revolutionary War. It is when a leader or a group of person are willing to loose as much people it needs to discourage the attackers.