 On 17 August additional ARVN forces supported by two battalions of the 173rd Airborne Brigade arrived and broke the siege.In May 1966 Operation Paul Revere was launched in the Đức Cơ tactical area.On 24 June the 1st Battalion, 35th Infantry and 3rd Squadron, 4th Cavalry Regiment engaged a PAVN Battalion close to the Cambodian border losing 15 U.S. killed.