Iron Triangle (Vietnam) Iron Triangle (Vietnam) The Iron Triangle (Vietnamese:"Tam Giác Sắt") was a area in the Bình Dương Province of Vietnam, so named due to it being a stronghold of Viet Minh activity during the war. The region was under control of the Viet Minh throughout the French war in Vietnam and continued to be so throughout the phase of American involvement in the Vietnam War, despite concerted efforts on the part of US and South Vietnamese forces to destabilize the region as a power base for their enemy, the communist North Vietnamese–sponsored and–directed South Vietnamese insurgent movement, the National Liberation Front
Battle of the Iron Triangle sent the 141st Regiment, 7th Division south from its position along Highway 13, north of Lai Khê, to reinforce the 9th Division north of Base 82. The 9th Division meanwhile began shifting the 272nd Regiment north from the southern part of the Iron Triangle to assist in the defense of Base 82 and Rach Bap. The summer monsoon had arrived in Bình Dương Province and rains and low cloud cover further reduced the effectiveness of RVNAF support for the attack. A dense rubber plantation northwest of Base 82 provided excellent concealment for supporting defensive positions and observation of local Route