Um...Baghdad has a population of 6 million.Iraqs population is...

Um...Baghdad has a population of 6 million.
Iraqs population is 26 million, what about the other 20 million people outside of Baghdad?

Let's say only 5% will fight for Iraq (1 in 20) that means that there is still 1 million potential fighters outside Baghdad.

Me thinks that the allies should be careful and not fall into the mother of all traps.........