
Lima Site 85 and the secret Air Force radar facility sat atop one of the highest mountains in Laos, 15 miles away from the border with North Vietnam. The site was defended by a force of 1,000 Hmong irregulars in the valley below, but a key element in its security was the mountain itself.
The drop on three sides was nearly vertical, and US officials did not believe the enemy could climb the cliffs. The fourth side of the mountain was fortified.
The assumptions were wrong. On the night of March 10-11, 1968, under cover of a massive artillery and infantry assault on the mountain, a team of North Vietnamese sappers scaled the cliffs, overran the radar site, and killed more than half of the Americans they found there.
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