This film is based on the real fighting in the Vietnam War. In November 1965, the Vietnam War escalated to the stage when the US military was directly involved in the war. The number of US troops stationed in Vietnam is on the rise. Lieutenant Colonel Moore (Mel Gibson Mel Gibson) is ordered to train a group of recruits into real warriors, with many family members pouring in at the same time, playing the dual roles of husbands and soldiers, with a warm atmosphere mixed with a sense of uneasiness. In order to alleviate the monotonous military life, the army held a large party. When the time came for the battle, Moore solemnly promised to "bring back every soldier" at the ceremony. Moore and his troops were parachuted into the river valley near Cambodia, where the North Vietnamese army is heavily armed. The weak American army was heavily surrounded and suffered heavy casualties. Finally, with the help of artillery and helicopters, the war began to stalemate. The next day, when the battle advanced to the hill but was still unable to break through the siege, Moore sought the help of the air force, and because the two sides were too close, American petrol bombs injured some of the ground troops. Photojournalist Joe (Barry Pepper) records the cruel scenes of the battle. On the third day, the US military was preparing for a decisive close battle, this time and space.