Battle of the Iron Triangle ending a bitter four-month struggle. Following the withdrawal from Base 82 COSVN organized a new corps headquarters in the Tay Ninh- Binh Long region and designated it the 301st Corps. This corps would soon direct the combat operations of the 7th and 9th NVA Divisions, separate regiments, and additional formations already en route from North Vietnam. Meanwhile General Thuần decided to rest the tired troops of the 5th Division and turned his attention to sending his 25th Division to clear out the PAVN bases in the Ho Bo area west of the Iron Triangle. The ARVN defenses around An Dien
Battle of the Iron Triangle although he had accurate intelligence concerning the size, composition, and location of his enemy. His initial plans, which proved unrealistic, called for virtually simultaneous recapture of the three lost bases by about 22 May. Except for the few ARVN infantry and engineers that were thrown across the Thi Thinh River to reinforce the An Dien bridgehead, the first major ARVN unit to move into the Triangle was a battalion of the 43rd Infantry, 18th Division, which crossed on Route 14 north of Phú Cường. Shortly reinforced by the rest of the regiment, this element, followed by the 322nd Armored Task