Eleven years later, the United States is fighting the Vietnam War. US Army Lieutenant Colonel Hal Moore is chosen to train and lead a battalion. After arriving in Vietnam, he learns that an American base has been attacked and is ordered to take his 400 men after the enemy and eliminate the North Vietnamese attackers although intelligence has no idea of the number of enemy troops. Moore leads a newly-created air cavalry unit into the Ia Drang Valley. After landing, the soldiers capture a North Vietnamese soldier and learn from him that the location they were sent to is actually the base camp for a veteran North Vietnamese army division of 4,000 men.