About 150,000 U.S. and allied troops were in Iraq after the invasion , at a time when war planners were assuming that Iraq 's government would remain functional after Hussein 's ouster and that there would be no mass insurgency . the Combat Studies Institute history of U.S. war 's first two years says Iraq was unprepared for chaos . U.S.-led coalition did n't have enough troops after David Perkins fall , report says . `` This is a recipe for disaster , '' one general recalls saying of About 150,000 decision .
the Combat Studies Institute history of U.S. war 's first two years says Iraq was unprepared for chaos . U.S.-led coalition did n't have enough troops after David Perkins fall , report says . `` This is a recipe for disaster , '' one general recalls saying of About 150,000 decision .