Dong Re Lao Mountain is located at in the A Shau Valley, Vietnam, near the Laotian border. It is densely forested and rises to 4879feet, 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.[1] 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.[2]