After seizing Tây Đô citadel and marching onward to attack Ninh Bình, on 20/5/1545, Dương Chấp Nhất invited Kim to visit his military camp.
Dương Chấp Nhất, having secured the capture of Tây Đô citadel and begun his march towards Ninh Bình on May 20, 1545, extended an invitation for Kim to visit his military headquarters.