at almost the same time, former navy s.e.a.l. glenn dougherty arrives in benghazi with a rescue team from tripoli. >> he chose to run in and defend, even though it wasn't his job. >> he ran in? >> that's how glenn has lived his whole live. anything you need at any time, he's in for you. >> by 4:00 a.m., glenn dougherty and tyrone woods team up. they're protecting at least 30 americans against overwhelming odds. >> literally the 30 or so individuals that were there could have all been killed or captured. >> and then the final blow. the full-on assault comes between 4:00 and 5:00 a.m. libya time. >> there were three mortars that were dropped that hit the roof of the building. >> it was overwhelming injuries.