During the Buddhist crisis of 1963, Trí garnered considerable notoriety for his crackdown on Buddhist protests against the Diệm regime in the central region of Vietnam. In Huế, demonstrations were banned and Trí's forces were ordered to arrest those who engaged in civil disobedience. At 13:00 on 3 June, some 1,500 protestors attempted to march towards the
Từ Đàm Pagoda in Huế for a rally, having gathered at Bến Ngự bridge near the
Perfume River. The symptoms consisted of severe blistering of the skin and respiratory ailments. The incident raised concerns among the Americans that poison gas was used, and the U.S. threatened to publicly condemn and distance itself from Saigon. Monks tried to cremate as per their custom the coffin of their colleague who had self-immolated. ARVN soldiers, firing M1 rifles, overran the pagoda and confiscated the coffin. They demolished a statue of
Gautama Buddha and looted and vandalized the pagoda before detonating explosives and leveling much of the pagoda. A number of Buddhists were shot or clubbed to death. The most determined resistance occurred outside the
Diệu Đế Pagoda in Huế. As troops attempted to erect a barricade across the bridge leading to the pagoda, the crowd fought the heavily armed military personnel with rocks, sticks and their bare fists, throwing back the tear gas grenades that were aimed at them. After a five-hour battle, the military finally took the bridge at dawn by driving armored cars through the angry crowd. The defense of the bridge and Diệu Đế left an estimated 30 dead and 200 wounded. a Catholic priest and opponent of Diệm's brother Archbishop
Pierre Martin Ngô Đình Thục, were also arrested. Despite his vigorous application of Diệm's military policies against Buddhists in central Vietnam, where in the words of
Ellen Hammer, Trí "ruled...with an iron hand", he was still involved in plotting against the regime even before the attacks on the pagodas. ==Coup against Diệm==