Many areas and mountains in the A Luoi region became historical in the mid-late 1960s during the Vietnam War, such the Battle of A Shau, the 5th Special Forces Camp that was overrun in 1966, as well as the 4,878-foot Dong Re Lao Mountain best known as the "Signal Hill" that was seized by 1st Cavalry Division LRRP / Rangers in 1968 during Operation Delaware.