It's 1964 and Lt. Col. Hal Moore (MEL GIBSON) and his wife, Julie (MADELEINE STOWE), and children have arrived at Fort Benning, GA where he's to preside over the Air Cavalry unit there with the assistance of Sgt. Major Basil Plumley (SAM ELLIOT). A deeply religious family man, Moore has come up with the revolutionary concept of using helicopters to drop men into battle situations and has thus enlisted chopper pilot Maj. Bruce Crandall (GREG KINNEAR) to assist in training his men.
Among them is Lt. Jack Geoghegan (CHRIS KLEIN), who's just become a parent along with wife Barbara (KERI RUSSELL). Moore and Plumley then train him and many others until they're finally sent off to Vietnam just as Moore is given command of the 7th Cavalry, a point he ironically states was also under Gen. Custer's leadership long ago.
Arriving in Ia Drang - a.k.a. "The Valley of Death" - in November 1965, Moore and his men suddenly find themselves vastly outnumbered by the Vietnamese forces that quickly surround them. Over a several day period, and as documented by photojournalist Joe Galloway (BARRY PEPPER), the Americans - despite suffering heavy losses that Julie and Barbara dutifully report to the other wives - don't give up as they try to figure out how to get themselves out of the precarious situation.