In one word, how did XXX die?
Li Jiji
Believing that success would mean total victory but that failure would mean total defeat (as the surprise attack was a desperate measure given that Later Tang was having difficulty supplying its army), he sent Lady Liu and Li Jiji back to Xingtang, and bade farewell to them, informing them that if he failed, they should gather all the family members at the Xingtang palace and commit suicide by setting fire to it.