During the
Vietnam War against the Americans and South Vietnamese, he led the attack on
Saigon during the
Tet Offensive of 1968 and commanded the B2 Front during the
Easter Offensive. During a 1974 meeting of North Vietnamese military leaders in Hanoi, Trà argued against a conservative strategy during the coming year and suggested that South Vietnam's
Phước Long Province be attacked in order to test both
South Vietnamese and American military reaction. The attack was successful and the U.S. did not respond militarily, prompting larger, more aggressive communist operations. In April 1975, Trà became Deputy Commander of the A75 headquarters under Senior General
Văn Tiến Dũng during the
Ho Chi Minh Campaign, the final assault on Saigon which led to the capitulation of the South Vietnamese government. He took charge of Vice-Minister of Defence from 1978 to 1982. In 1982, Trà published
Vietnam: A History of the Bulwark B-2 Theatre, Volume 5, Concluding the 30-Years War, which revealed how the
Hanoi Politburo had overestimated its own military capabilities and underestimated those of the U.S. and South Vietnam prior to and during the
Tet Offensive. This account offended and embarrassed the leaders of the newly unified
Socialist Republic of Vietnam. This was probably the reason he lost his membership in the
Central Committee, and only two volumes were ever published of the five Tra had planned. Suggestions that he remained in such disgrace as to be under something similar to house arrest, until his death on 20 April 1996, are exaggerated. He published two articles in
Tap chi lich su quan su [Journal of military history] in 1988, and he was even permitted to travel to the United States in 1990 to present a paper at a conference at Columbia University. In 1992, the People's Army published another volume of his projected five-volume history of the B-2 Theater. From 1992 to 1996 he was Deputy Chairman of the Veterans Association of Vietnam. ==Notes==