Yu and Han Xin's request angered him, because he was expecting Han to come to his aid. However, Zhang Liang and Chen Ping cautioned Liu Bang against rejecting the request, because Han Xin may become discontented and would rebel, putting them in a dangerous situation. Liu Bang reluctantly agreed to Han Xin's request. Meanwhile, Xiang Yu sent Wu She to persuade Han Xin to declare independence from Liu Bang and form an alliance with him, in hope of losing an opponent on the northern front. Kuai Che also strongly urged Han Xin to rebel against Liu Bang, warning him that Liu was starting to distrust him because he wielded too much power. However, Han Xin refused to renounce his loyalty to Liu Bang. Battle of Gaixia In 203 BC, Liu Bang came to an armistice with Xiang Yu, known as the Treaty of Hong Canal, which divided China into west and east under their respective domains. Shortly after, Liu Bang renounced the treaty and led an attack on Xiang Yu's forces, which were retreating east. Liu Bang sent messengers to request assistance from Han Xin and Peng Yue in forming a three-pronged attack on Western Chu, but Han Xin and Peng Yue did not mobilise their troops, and Liu Bang was defeated by Xiang Yu in the Battle of Guling. Liu Bang retreated back to his territory and strengthened his defences, while sending messengers to Han Xin and Peng Yue again, promising to grant them land and titles if they helped him defeat Xiang Yu. Han Xin and Peng Yue brought their armies to meet Liu Bang in late 203 BC, and Han suggested using a strategy of "ambush on ten sides" () to weaken Xiang Yu's forces before making a final assault. The plan succeeded, and by 202 BC Xiang Yu was trapped in Gaixia and surrounded by Han forces on all sides. He attempted to break out of the encirclement and eventually arrived at the bank of the Wu River, where he made a last stand before committing suicide. After Xiang Yu's death, China was unified under Liu Bang's rule, and Liu granted Han Xin the title of "King of Chu" in recognition of his contributions. Months later, Liu Bang was proclaimed "Emperor" and became known as "Emperor Gaozu of Han". Service during the Western Han dynasty Demotion When Xiang Yu died in 202 BC, Zhongli Mo (one