On 1 November 1963, Tung was summoned by the coup organisers to the Joint General Staff headquarters near Tân Sơn Nhứt Air Base, on the pretext of a routine officers' lunch meeting. At 13:30, General Trần Văn Đôn announced that a coup was taking place.
On November 1, 1963, Tung was called by the coup planners to the Joint General Staff headquarters near Tân Sơn Nhứt Air Base for what seemed like an ordinary officers' meeting. At 1:30 PM, General Trần Văn Đôn declared that a coup had taken place.