Well if we're going into prophesies:
Former CENTCOM commander General Anthony Zinni says of course our forces in Iraq have been too small from the start and the US military always knew it would need much larger forces to assert firm control of Iraq after an invasion.
"When I was commander of CENTCOM, we had a plan for an invasion of Iraq, and it had specific numbers in it. We wanted to go in there with 350,000 to 380,000 troops. You didn't need that many people to defeat the Republican Guard, but you needed them for the aftermath. We knew that we would find ourselves in a situation where we had completely uprooted an authoritarian government and would need to freeze the situation: retain control, retain order, provide security, seal the borders to keep terrorists from coming in.
When I left in 2000, General Franks took over. Franks was my ground-component commander, so he was well aware of the plan. He had participated in it; those were the numbers he wanted. So what happened between him and Rumsfeld and why those numbers got altered, I don't know, because when we went in we used only 140,000 troops, even though General Eric Shinseki, the army commander, asked for the original number."
Army Intelligence 1. God 0.