>> reporter: the americans call for air strikes and they come with thundering force. [ explosions ] >> we brought in spectre gunships which can put a bullet on every inch of a football field. >> the amount of ordinance dropped over a period of two weeks almost defies belief. the mountains were rearranged. >> reporter: from a radio, word of a dead al qaeda fighter. the americans hear bin laden try to rally the men. >> we hear him apologize to them for having led them to an area where they are having air strikes on them relentlessly. >> reporter: with bin laden in the crosshairs, berntsen wants u.s. forces sent in to finish the job. >> in the first two or three