in his book fiasco thomas e. ricks writes , internal army reports said that this unit ( odiernos 4th infantry division ) a heavy armored division , despite the name used ham-fisted approaches that may have appeared to pacify its area in the short term , but in the process alienated large parts of the populationfourth id fueled the insurgencythey were cowboysevery male from sixteen to sixtythat the 4th id could catch was detainedand when they got out , they were supporters of the insurgency .