We Were Soldiers is a 2002 American war film co-produced, written for the screen, and directed by Randall Wallace and starring Mel Gibson (both of whom previously worked together on Braveheart), Madeleine Stowe, Greg Kinnear, Sam Elliott, Chris Klein, Keri Russell, Barry Pepper, Ryan Hurst, Marc Blucas, Clark Gregg, and Jon Hamm. The film is based on the 1992 book We Were Soldiers Once… and Young by Lieutenant General (Ret.) Hal Moore and reporter Joseph L. Galloway, dramatizing the Battle of Ia Drang on November 14, 1965.

In 1954, the French Army's Group Mobile 100, on patrol during the First Indochina War, is ambushed by Viet Minh forces. Viet Minh commander Nguyen Huu An orders his soldiers to "kill all they send, and they will stop coming".

Eleven years later in 1965, 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; 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 scout and learn from him that the location they were sent to is the base camp for a veteran North Vietnamese army division of 4,000 men.

Upon arrival in the area with a platoon of soldiers, 2nd Lt. Henry Herrick spots another enemy scout and runs after him, ordering his reluctant soldiers to follow. The scout lures them into an ambush, which results in several men being killed, including Herrick and his subordinates. The surviving platoon members are surrounded and cut off from the rest of the battalion. Sgt. Savage assumes command, calls in the artillery, and uses the cover of night to keep the Vietnamese from overrunning their defensive position.

Meanwhile, with helicopters constantly dropping off units, Moore manages to secure weak points before the North Vietnamese can take advantage of them. Despite being trapped and desperately outnumbered, the main US force manages to hold off the North Vietnamese with artillery, mortars, and helicopter airlifts of supplies and reinforcements. Eventually, Nguyen Huu An, the commander of the North Vietnamese division, orders a large-scale attack on the American position.

Back in the United States, Julia Moore has become the leader of the American wives who live on the base. When the Army begins using taxi drivers to deliver telegrams that notify the next of kin of the soldiers' deaths, Julia takes over that responsibility.

At the point of being overrun by the enemy, Moore orders 1st Lt. Charlie Hastings, his forward air controller, to call in "Broken Arrow", a call for all available combat aircraft to attack enemy positions, even those close to the US troops' position, because they are being overrun. The aircraft attacked with bombs, napalm, and machine guns, killing many People's Army of Vietnam and Viet Cong troops, but a friendly fire incident also results in American deaths. The North Vietnamese attack is repelled, and the surviving soldiers of Herrick's cut-off platoon, including Savage, are rescued.

Moore's troops regroup and secure the area. Nguyen Huu An plans a final assault on the Americans and sends most of his forces to carry out the attack, but Moore and his men overrun them and approach the enemy command center. Before the base camp guards can open fire, Major Bruce "Snake" Crandall and other helicopter gunships attack and destroy the remnant of the enemy force. With no more troops to call on, Huu An quickly orders the headquarters evacuated.