How did Li Yunlong die in the novel?

In the novel, Li Yunlong did not die directly. He was killed by Japanese agents in the second half of the novel. At the end of the novel, Li Yunlong and his troops suffered heavy casualties in the battle with the Japanese army, leaving only him and some young soldiers. In this case, Li Yunlong was captured by the Japanese agents and tried to use him as bait to lure the Chinese army to surrender. However, Li Yunlong still firmly refused the Japanese army's request after suffering many abuse and torture. He was finally killed by Japanese agents.