If this is the incident I believe it is, I saw a documentary on the history channel about it. Rangers were pinned down until an A10 put a 500 pounder practically into a bucket to take out the bad guys...amazing!
This incident has been widely covered and is just an amazing story. The Chinook carrying his team of Rangers was shot down on the way to try to rescue Navy SEAL Neil Roberts and what ensued was the highest altitude battle ever fought by US troops. After losing much of his team to the initial RPG that hit the Chinook, Self and his Rangers spent the day taking back the hill with the help of air support.
This book has some of the best descriptions from the battlefield I’ve ever seen. Here it is again: http://www.youtube.com/watch?v=1LH9eiT-0H8