A long-range penetration operation was launched by members of the Division's long-range reconnaissance patrol (LRP) against the PAVN when they seized "Signal Hill"—the name attributed to the peak of Dong Re Lao Mountain, a densely forested 4879 feet mountain midway in the valley—so the 1st and 3rd Brigades, slugging it out hidden deep behind the mountains, could communicate with Camp Evans near the coast or with approaching aircraft.