The battle for Dak to is the longest and bloodiest, single campaign of the Vietnam War. More than 1600 enemy dead and 285 American lives testify to its ferocity. Artillery and mortars pound enemy positions and block escape routes. - NICE FOOTAGE - A mountain side is destroyed by battling. A giant helicopter lands a water tank to American forces entrenched on a hillside. Troops line mortar shells. A sign next a pile of sand reads, "Battery 4th / 42nd Artillery - Sandbaggers - ""You yell. We shell. Like Hell!"" - Open 24 Hours Daily." Artillery installations fire rounds from fortified positions. Smoke blows over the whole scene. Plumes of white smoke rise from nearby mountains where shells have landed. Three close-up shots of artillery batteries firing and two shots of groups of soldiers firing grenades from sandbagged positions.