On January 31, 1968, the North Vietnamese Army launches the surprise "Tet Offensive", simultaneously attacking dozens of South Vietnamese cities. Among them is the ancient city of Hue. A very small contingent of US Marines and South Vietnamese Army troops defend the city and they are quickly surrounded and badly outnumbered 10 to 1. At first the Marines have no idea as to the extent of the attack and do not know that nearly all the city has fallen under Communist control. As they begin their counter-attacks, they meet stiff and determined resistance. Even as reinforcements arrive, narrowing the odds to 4 to 1, the Marines are continually pinned down by dangerous machine gun nests and hidden North Vietnamese troops. The Marines had to attack the communists block by block, building by building, to drive them out. As the battle unfolds, strategic objectives change by the day. It becomes clear that they will have to drive the North Vietnamese out of the South side of Hue before they can regain control of the city.