of the war with the French were reorganised as the first five military regions, and in the next two years, several divisions were reduced to brigade size to meet the manpower requirements of collective farms. By 1958, it was becoming increasingly clear that the South Vietnamese government was solidifying its position as an independent republic under Ngô Đình Diệm, who staunchly opposed the terms of the Geneva Accords, which required a national referendum on unification of north and south Vietnam under a single national government. North Vietnam prepared to settle the issue of unification by force. In May 1959, the first major steps to prepare infiltration routes into South Vietnam were taken; Group 559 was established, a logistical unit charged with establishing routes into the south via Laos and Cambodia, which later became famous as the Ho Chi Minh Trail. At about the same time, Group 579 was created as its maritime counterpart to transport supplies into the South by sea. Most of the early infiltrators were members of the 338th Division, former southerners who had been settled at Xuan Mai from 1954 onwards. Regular formations were sent to South Vietnam from 1965 onwards; the 325th Division's 101B Regiment and the 66th Regiment of the 304th Division met U.S. forces on a large scale, a first for the PAVN, at the Battle of Ia Drang Valley in November 1965. The 308th Division's 88A Regiment, the 312th Division's 141A, 141B, 165A, 209A, the 316th Division's 174A, the 325th Division's 95A, 95B, the 320A Division also faced the U.S. forces which included the 1st Cavalry Division, the 101st Airborne Division, the 173rd Airborne Brigade, the 4th Infantry Division, the 1st Infantry Division and the 25th Infantry Division. Many of those formations later became main forces of the 3rd Division (Yellow Star Division) in Binh Dinh (1965), the 5th Division (1966) of 7th Military Zone (Capital Tactical Area of ARVN), the 7th (created by 141st and 209th Regiments originated in the 312th Division in 1966) and 9th Divisions (first Division of National Liberation Front of Vietnam in 1965 in Mekong Delta), the 10th Dakto Division in Dakto – Central Highlands in 1972. On 20 December 1960, anti-government forces in South Vietnam joined together to form a united front called National Liberation Front of South Vietnam (Mặt trận Dân tộc Giải phóng Miền Nam Việt Nam) or simply known as the Vietcong in the