In the Battle of Kunyang that occurred in 23 AD, Liu Xiu and other 20,000 Green Forest Army defeated 420,000 people of the New Dynasty's ** Army, which was a complete miracle. In the Battle of Kunyang, many people praised Liu Xiu for using his troops like a god, but in fact, he met a "pig-like opponent", and Song Xianggong's benevolence, which caused this miracle. 
1. The Green Forest Army defeated Yan You and Chen Mao under the city of Nanyang, and then Liu Xuan proclaimed himself emperor and publicly proposed to restore the Han Dynasty and establish a new regime.
"Zizhi Tongjian" records: Wang Mang heard that Yan You and Chen Mao were defeated, so he sent Sikong Wang Yi to pass on and send troops with Situ Wang Xun to pacify Shandong. Sixty-three families of the Ming Art of War were recruited to prepare military officials, and the elder giant mother was used as the captain, and the fierce beasts of tigers, leopards, rhinos, and elephants were driven to help the might. From Yi to Luoyang, the prefectures and counties each selected elite soldiers, shepherds guarded their own generals, and there were 420,000 people who were set to meet, with a number of millions; The rest of those who are in the Tao, carrying flags and baggage, thousands of miles away. In summer, in May, Xun and Yi Nan went out of Yingchuan, and Yan You and Chen Maohe.With such a powerful army, the Mang army should of course carry out the "decapitation operation" and go straight to the base camp of the first emperor Liu Xuan, without any delays along the way. Even if it encounters the resistance of the Green Forest Army, the Mang Army should leave a small force to confront it, and the main force will continue to move south without stopping. After the forward 100,000 troops arrived in Kunyang, the commander Wang Yi immediately ordered the siege of Kunyang. Based on the lessons of the defeats in previous battles, General Yan You believed that Kunyang, a small city that was both strong and unhindered, should not be used for the large army, and that the army should go straight to Wancheng and break the Han army besieging Wancheng, then Kunyang would not attack itself.
"Zizhi Tongjian": Xun and Yi surrounded Kunyang, Yan You said: "Kunyang City is small and strong, and the fake number is in Wan, and he will run if he is eager to enter the army." Wan defeated, Kunyang self-serving. Yi said: "I used to surround Zhai Yi, and I couldn't sit back and be responsible." Today, millions of people will not be able to go down when they meet the city, so they will demonstrate. Slaughter this city first, enter with blood, sing and dance before and after, don't care about the unhappiness and evil! "Then the siege is dozens of heavy, hundreds of camps, the sound of cymbals and drums is heard for dozens of miles, or for the tunnel, rushing to hit the city; The crossbows were piled up and sent out like rain, and the city was drawn by the households. Wang Feng and the others begged to surrender, but they were not allowed. Xun and Yi think that their achievements are missing, and they do not worry about the military. Yan You said: "The Art of War": 'Besieging the city is a que', it is advisable to make it easy to escape. Yi didn't listen.More than 400,000 troops came to Kunyang City, but instead of leaving 100,000 troops to attack the city, the main force went south to break through the Green Forest Army besieging Nanyang. You must know that Kunyang City is not big, and it is impossible for more than 400,000 troops to attack. More than 400,000 troops of the Mang army stayed under the city of Kunyang, which seemed to be a siege, but in fact, more than 400,000 troops were pinned down under the city by a small army of Kunyang. If you really want to attack the city, 100,000 or even 70,000 or even 70,000 people are enough, and you can also divide the army into several parts and take turns to attack. Under the army of Kunyang City, it is already a huge mistake not to actively rescue Wancheng (Nanyang) when it is besieged.
Second, the Mang army actually singled out Liu Xiu and rushed back to Kunyang City with reinforcements, bringing the news that Wancheng was broken by the Green Forest Army, which was a huge encouragement to the Green Forest Army in the city. In order to boost everyone's fighting spirit, Liu Xiu led more than 1,000 infantry cavalry as the vanguard, and Li Yi led the main force to follow up. Wang Yi and Wang Xun also sent thousands of troops to meet the battle.
"Zizhi Tongjian" records: If Liu Xiu goes to Yun and Dingling, he will send all the battalions. The generals were greedy for their possessions, and wanted to divide their forces to defend them. Xiu said: "If you break the enemy today, the treasure will be ten thousand times, and it will be a great success; If they are defeated, and the leaders are left, what wealth is there! "It's all about it. In June, Ji Mao Shuo, Xiu and the battalions marched together, since the general rode more than a thousand as the forward, went to the army for four or five miles; Xun and Yi also sent thousands of troops to synthesize, show Benzhi, and beheaded dozens of levels. The generals rejoiced: "General Liu has seen a small enemy in his life, but now he sees a big enemy bravely, which is even strange!" And before you re-settle, please help the general! "Xiu re-entered, searching, and Yi soldiers, all the departments multiplied it, and beheaded hundreds of thousands of levels.Kun** has strategic value, and the Green Forest Army must be rescued, in fact, this is the best "encirclement point reinforcement". The Mang army left 100,000 people to continue to besiege Kunyang, and the main force was deployed to ambush reinforcements on the road from Wancheng (Nanyang) to Kunyang, which was a good strategy. The problem is that the Mang army did not make any preparations, and directly allowed Liu Xiu's reinforcements to join the Kunyang defenders. Even so, the Mang army was not at the point of collapse, until the Mang army actually sent 10,000 people to fight Liu Xiu's "death squad" alone. Liu Xiu also selected a death squad of 3,000 people to attack the backbone of the new army from the west of the city. Wang Yi and Wang Xun despised Liu Xiu and thought that it would be easy to defeat Liu Xiu. Therefore, they only led more than 10,000 people to inspect the position. In order to prevent confusion among the battalions, they ordered the battalions to strictly control their troops and not to send troops without orders.
"Zizhi Tongjian" records: consecutive victories, before the victory, the generals are more and more courageous, all of them are a hundred, Xiu Nai and 3,000 people who dare to die from the west of the city to rush to the backbone. Xun, Yi Yizhi, since the more than 10,000 people will be Chen, all the battalions are not moved, and the Han soldiers are alone, it is unfavorable, and the army does not dare to save each other. Xun and Yi Chen were in turmoil, and the Han soldiers took advantage of the sharp collapse and killed Wang Xun. The city also made a noise, and the Chinese and foreign countries joined forces, shaking the heavens and the earth. The reckless soldiers were defeated, and the walkers trampled each other, and the corpses were ambushed for more than a hundred miles. There will be thunder, wind, roof tiles all flying, rain like a note, the river overflowing, tigers and leopards are fighting, soldiers go to the water to drown in the tens of thousands, the water does not flow. Wang Yi, Yan You, and Chen Mao rode lightly on the dead to cross the water, and they were all covered by the weight of their army, and they had no chance of winning, and they could not be counted for months, or the rest were burned. The soldiers ran away, each returning to its county, Wang Yi Du and the general Chang'an bravely returned thousands of people to Luoyang, and Guanzhong was shocked when he heard it. So Hai Nei Hao responded suddenly, killed his shepherd, called himself a general, and waited for the edict with the name of the Han Dynasty.The Mang army turned out not to concentrate superior forces to besiege Liu Xiu's 3,000 "daring to die", but Wang Yi and Wang Xun led 10,000 people to carry out a "gentleman's war" with Liu Xiu's "death squad" with the Song Xiang formula. What's more, Wang Yi and Wang Xun, the two "Song Xianggongs", did not allow other troops to fight without authorization, resulting in more than 10,000 reckless troops who were negligent in the battle formation being defeated by Liu Xiu's "death squad", and even the commander Wang Yi was killed in front of the formation. It can be said that the "benevolence of Song Xianggong" in the Mang army led Liu Xiu to have the opportunity to use 3,000 "daring people" to create an opportunity to "take the head of the general in the million army". If Wang Yi and Wang Xun sent ten "10,000 teams" to take turns to consume Liu Xiu's "daring deaths" one by one, just like Han Xin's "ambush on all sides" of Xiang Yu, what if Liu Xiu had great ability? Some people believe that Wang Yi and Wang Xun lacked experience in commanding large corps to fight, so they were defeated by Liu Xiu. In fact, as long as Wang Yi and Wang Xun have a little less "Song Xianggong's benevolence", as long as the Mang army "defeats the widow with the crowd" and Liu Xiu's army lasts for consumption, what can Liu Xiu's army increase tenfold? He mastered an army of more than 400,000 people, but he only dispatched an army of 10,000 people to "go head-to-head" with Liu Xiu's 3,000 death squads, and even did not let other troops rescue, so he was finally "counter-killed" by Liu Xiu's army.