one unit from restrepo climbed down in the middle of the night through the hills and took up a post inafehouse in the middle of this village. the other unit openly, overtly walked, drove, and moved into the village on the other side and set up position in a farmhouse. >> it's a trap to catch the taliban. and things are going just as planned, until a tragic mistake changes everything. >> so i was filming and suddenly there's this very loud explosion. >> a u.s.-fired mortar lands directly on the safehouse where part of the unit waits in ambush. >> it was a really, really awful moment, because what it meant was that the operation that we had thought we were going to do, suddenly turned into this very dire situation. >> i remember as soon as we heard that bang, we knew something was wrong. then we heard the most disturbing thing. we could hear the soldiers crying out for help, crying out in pain, and it was a horrible thing. >> there was nothing we could do other than watch and film. >> the mission changes to a rescue as apache helicopters are called in to retrieve the wounded. >> everythi