(later Suzong) also received important strategic military information from Chang'an when it was occupied by An Lushan though secret message sent by Amoghavajra. Siege of Suiyang In the beginning of 757 and continuing through October of that year, a protracted stalemate between the Yan and Tang forces occurred in Suiyang. This effectively blocked the Yan forces from attacking the extensive areas south of the Yangzi River, which remained relatively untouched by the An–Shi disturbances. Implosion of Yan Dynasty and end of the rebellion The Tang imperial forces were helped by the newly formed dynasty's internal fighting. On 29 January 757, An Lushan was betrayed and killed by his son, An Qingxu, (An Lushan's violent paranoia posed too much of a threat to his entourage). The rebel An Lushan had a Khitan eunuch named Li Zhu'er (李豬兒) (Li Chu-erh) who was working for An Lushan when he was a teenager but An Lushan used a sword to sever his genitals as he almost died after losing multiple pints of blood. An Lushan revived him after smearing ashes on his injury. Li Zhu'er was An Lushan's eunuch after this and highly used and trusted by him. Li Zhu'er and another two men helped carry the obese An Lushan when he was taking off or wearing his clothes. Li Zhu'er helped cloth and take of his clothes at the Huaqing (Hua-ch'ing) steam baths granted by Emperor Xuanzang. Li Zhuer was approached by people who wanted to assassinate An Lushan after An Lushan became paranoid and blind, stricken with skin disease and started flogging and murdering his subordinates. An Lushan was hacked to death in his stomach and abdomen by Li Zhuer and another conspirator, Yan Zhuang (Yen Chuang) (嚴莊) who was beaten by An before. An Lushan screamed "this is a thief of my own household" as he desperately shook his curtains since he could not find his sword to defend himself. An Lushan's intestines came out of his body as he was hacked to death by Li Zhuer and Yan Zhuang. A horse was once crushed to death under An Lushan's sheer weight due to his fatness. On 10 April 759, An Qingxu was killed by General Shi Siming, An Lushan's loyal follower and childhood friend. Soon after, Shi recaptured Luoyang. However, on 18 April 761, Shi Siming was killed by his son, Shi Chaoyi, who promptly proclaimed himself emperor, even though