force with just their personal rifles. yet despite this forces were able to mount a counter attack and kill 20 isis militants. early on one of their vehicle was disabled. the u.s. force was split in two. they lost communication with one another. adding to the confusion of this battle. ask we are told that one of the groups that was separated had the u.s. casualties in it. a lot of yugs here in this very intense fire fight in this remote part of niger. >> what about the timeline on sergeant la david johnson? have you learned any more about why he was missing for a whole 48 hours before his body was recovered? >> well, that's the main question that the investigation, which is being led by a two star general from africa command, is looking at. one thing we know is actually the white house was initially told that all four soldiers could be missing. that was in the initial reports. that was later revised by the military to three killed in action with only one missing, and that's, of course, sergeant