Please provide an example of failure due to complacency after success.

Li Zicheng, a native of Mizhi County, Shaanxi Province, formerly known as Hongji, was the leader of the peasant uprising in the late Ming Dynasty. When he proclaimed himself emperor, he regarded Li as Mao.

Li Zicheng was born in poverty and herded sheep for the landlord in his childhood. In the second year of Chongzhen (1629), he rebelled and fought bravely under Gao Yingxiang. At the Xingyang Congress in the eighth year of Chongzhen, he put forward the operational plan of dividing troops and attacking in four ways, which was approved by the leaders of various ministries and gained increasing prestige. The following year, after Gao Yingxiang's death, he continued to be called Chuangwang. Eleven years in Tongguan defeat, only rate Liu Zongmin and more than ten people, hidden in Shangluo (at the junction of Henan and Shaanxi) mountainous area. The next year, the mountain rose again. Thirteen years later, he was trapped in Yudu Mountain, Brazil, and broke through with fifty riders and entered Henan. At that time, the famine in the Central Plains was serious and the class contradictions were extremely acute. Yan Li put forward slogans such as "no tax on farmland". Li Zicheng made his mark in Xingyang. In the arduous war years when he overthrew the dynasty, he never gave in to any enemy, shared weal and woe with the soldiers, and put forward the slogan of "free food for all". At that time, the ballad said, "Eat his mother, love his mother, and you will never win the king. If you are not good, you won't get a meal. " At that time, it spread far and near and won the hearts of the people. The army has grown to millions and become the main force of the peasant war. In the sixteenth year of Chongzhen (1643), Li Zicheng was called Xinshun King in Xiangyang. In the same year, in Ruzhou (now Linru), Henan Province, Sun Chuanting, the governor of Shaanxi Province in the Ming Dynasty, was completely annihilated and successfully occupied xi 'an. In the first month of the following year, the Dashun regime, named Yongchang, was established.

1644, Li Zicheng's insurgents occupied Peking and overthrew the Zhu Ming dynasty which had ruled for 276 years. After Li Zicheng entered Beijing, his military discipline was strict, and he basically maintained the true colors of the peasant army. However, in the process of victory, he became proud. Not only did he not have a clear understanding of the complicated and changeable situation in the northeast border, but he also did not think of how to deal with the Qing army. He didn't take necessary precautions to deal with the increasing corruption of his subordinates and soldiers. Military commanders are busy "chasing soldiers to help pay salaries", civil servants are busy climbing poles in exams, and soldiers are addicted to victory, thinking that the battle is over and they can rest easy.

As a result, the insurgents lost their fighting spirit. Due to the support of the Qing army to Wu Sangui, the Li Zicheng Rebel Army was forced to retreat to Beijing, and the Qing army pushed the capital. Li Zicheng's failure in the Shanhaiguan campaign changed the situation greatly, and Ming officials who surrendered to the rebels came out to resist. Niu Jinxing, for example, was originally a juren of the Ming Dynasty. In order to avoid disasters, he joined the Rebel Army in Li Zicheng, which made great contributions to the early growth of the Rebel Army. Therefore, he was awarded the title of Master of Shenfu Hall. But he claimed to be the hero of the founding of the People's Republic of China, and privately told people that the peasant regime like Li Zicheng was doomed to failure. Under the unfavorable situation of the Rebel Army, he began to design and kill the Yan Li brothers, the generals of the Rebel Army. When Liu Zongmin got the news, he thundered against Niu Jinxing. Niu Jinxing soon left Li Zicheng and went to Henan, which split the Dashun regime. Finally, under the pursuit of the Qing army, Li Zicheng was forced to leave Beijing and retreat to Xi 'an. In December of the first year of Shunzhi (1644), the Qing army attacked Tongguan, and Dashun army lined up to meet. Because the main force and artillery haven't arrived yet, the Qing army insists on not fighting. In the second year of Shunzhi (1645), the red artillery of the Qing army attacked Tongguan, and Li Zicheng was defeated, so it retreated to the south and entered Hubei via Xiangyang, trying to unite with Zuo Liangyu, the commander-in-chief of the Ming Dynasty in Wuchang. Zuo Liangyu went east to Nanking, went to the "Jun Qing side" of Nanming court, and was on his way to conquer Ma Shiying and die. Li Zicheng entered Wuchang in April, but was defeated by the Qing army. Finally died in Jiugong Mountain, Tongshan County, Hubei Province.

Li Zicheng himself is "not greedy for money, lustful and aboveboard", but he "makes the mistake of being proud when he wins", which is worth learning from history.