Dong Re Lao Mountain

Dong Re Lao Mountain is located at 16°18′14″N 107°14′52″E / 16.3038°N 107.2479°E / 16.3038; 107.2479Coordinates: 16°18′14″N 107°14′52″E / 16.3038°N 107.2479°E / 16.3038; 107.2479 in the A Shau Valley, Vietnam, near the Laotian border. It is densely forested and rises to 4,879 feet (1,487 m), just north of A Luoi, a former French airfield.

In April 1968, during the Vietnam War, the mountain was the site of an intense battle between members of the American 1st Cavalry Division, long-range reconnaissance patrol troops, and the North Vietnamese Army. The mountain was dubbed "Signal Hill" by headquarters as it served as the lone radio relay site for American forces fighting in the valley during Operation Delaware.