from patrolling territorial waters, the Navy also had the mission of transporting military supplies to support the People's Army of Vietnam (PAVN) and the Vietcong during the Vietnam War. On 31 October 1961, a sea route version of the Ho Chi Minh trail was established by the Navy, with the 759th Transport Unit responsible for carrying military supplies and other goods for the Communist ground forces in South Vietnam. To avoid detection by the South Vietnamese and U.S navies, North Vietnamese transport ships were often disguised as fishing trawlers. On 16 February 1965, a 100-ton North Vietnamese trawler from the Transportation Group 125 was discovered at Vung Ro Bay. This led to the creation of Operation Market Time by the US Navy to intercept disguised enemy ships. On 19 April 1972, the Navy and Vietnam People's Air Force (VPAF) participated in the Battle of Đồng Hới off the coast of North Vietnam. During this battle it was believed that the U.S Navy destroyed a Soviet-made cruise missile for the first time. The destroyer was damaged after a VPAF MiG-17 dropped a bomb, destroying a aft gun mount. In the years following the complete withdrawal of U.S and other allied forces, the North Vietnamese went back on the offensive. As part of the Ho Chi Minh Campaign, the Navy increased the transportation of military supplies, food and uniform to the Communist forces in the South. When the PAVN occupied the northern provinces of South Vietnam in 1975, captured Republic of Vietnam Navy (RVNN) vessels were pressed into service with the Navy. In April 1975, ex-RVNN vessels carried North Vietnamese troops to capture the Spratly Islands. Opening battle in the island Southwest Cay (Vietnamese: Song Tử tây) on 4 April 1975, amphibious raid by sea of the Naval Marine corps number 1 (precursor of the 126th Brigade Naval Marine corps) and three vessels of the 125 corps coordinated with the commandos of the 5th Military Region, after 30 minutes, the Navy controlled the main battle area, facilitating the capture of the other islands. The Navy gained control of Sand Cay island (26 April), Namyit Island (27 April), Sin Cowe Island (28 April) and Spratly Island (29 April). The Chinese People's Liberation Army Navy (PLAN) had captured the Paracel Islands from the South Vietnamese in January 1974. These islands are also claimed by Vietnam, however they have no current presence there. Prior to