Rambovan's army has begun a standoff with the enemy, and the protagonist is thinking about a strategy to quickly break the tide of the war that threatens to turn into a war of attrition.

In a war, if an opponent with similar strength directly fights hard and wears it down, it will ultimately be the side with the advantage of hard power that wins, but both the winner and the loser need to pay a big price.

Therefore, military strategists in human history have pursued more cost-effective victories, and avoided the situation of attrition as much as possible by raiding, sneak attacking, or weakening the enemy's war potential.

However, if both sides of the war do not make major strategic mistakes and do not give the opponent a chance to take advantage of it, they will eventually return to the situation of fighting for national strength and attrition, and this is a dead knot.

For example, the Mongol war to destroy the Southern Song Dynasty ended up being a war of attrition, and the Southern Song Dynasty won two victories in the defense war, but its national strength and war potential were greatly weakened, and it was finally destroyed.

The first Mongol attack on the Song Dynasty was in the autumn of the second year of Duanping (1235), and more than 300,000 Mongol soldiers who were ready to attack in two directions. The Western Route Army was led by Kuoduan, the second son of Wokotai, and took Sichuan directly; The Eastern Route Army was led by the three sons of Wokotai, mainly attacking Jingxiang; In addition, the king of the sect did not spend money on the division to attack the two Huai.

At the beginning, the war on the Southern Song side was quite unfavorable, and the internal strife of the Southern Song Dynasty court led to a serious shortage of troops on the Sichuan front. Cao Youwen, who was under the command of the Imperial Soldiers and Horses stationed in the Quanzhou Prefecture of the Southern Song Dynasty, had to face the 130,000 troops of the Mongol army with only 20,000 field troops in Sichuan, but Cao Youwen commanded properly, defeated the Mongol army eight times in a row, and once repelled it, but could not be completely annihilated.

In the autumn of the third year of Duanping (1236), the Mongolian army invaded again, Cao Youwen was forced to go out to fight in the field by his boss Zhao Yanna, and there was no more soldiers to fight in Sichuan.

In February of the same year, the Northern Army of Xiangyang in the Southern Song Dynasty rebelled, and was captured by the Mongolian East Route Army, and the gate of the Jinghu area was opened, and the Mongolian army successively captured Suizhou, Jingmen Army, and Yingzhou, and forced Jiangling Mansion (now Jingzhou, Hubei). At this time of crisis, Song Lizong urgently dispatched Meng Hui to help, Meng Hui lived up to expectations, defended tightly, and finally forced back the Mongolian East Route Army.

Subsequently, the Song army supported Sichuan, and the Jinzhou Metropolitan Division, which had not yet fallen, attacked the Mongolian Western Route Army, and the existence of the Jinzhou Metropolitan Division threatened the Mongolian army's rear route, and the Western Route Army had to retreat.

The first Mongol attack on the Song Dynasty seemed to be in vain, but the destruction of the western Sichuan states had extremely serious consequences. Originally, Sichuan was roughly balanced, but after the war, western Sichuan was ruined and lost most of its tax revenue, and the defense of eastern Sichuan put great pressure on the central finances, so much so that the imperial court engaged in a fierce debate on whether to abandon eastern Sichuan.

The second Mongol attack on the Song Dynasty was in June of the 11th year of Chunyou (1251), when Meng Ge succeeded to the throne and began to adjust the strategy of fighting against the Song. On the one hand, they built forts on the Song-Mongolian border to prepare for large-scale and long-term wars; On the other hand, in order to avoid suffering setbacks in the Lianghuai region again, he learned from the wisdom of "borrowing the road" of the Mongols to destroy the Jin, and ordered Kublai Khan and Wuliang to attack Dali, trying to penetrate deep into the interior of the Southern Song Dynasty along Guangxi and Hunan, and implement the "belly cutting strategy" of the Southern Song Dynasty.

The Southern Song Dynasty sent troops to attack and prevent the Mongols from building cities, and at the same time strengthened the construction of cities on the border. At the same time, the Southern Song Dynasty also speculated that the Mongols might choose to attack by detour based on the Mongol military operations against Tubo and Dali, so the Southern Song Dynasty sent Li Zengbo to Guangxi to reorganize the armament, and contacted Yang Wenjun, the Tusi of Banzhou, to cross the snow-capped mountains and defeat the Mongol army in Tubo, so as to destroy the Mongol "belly plan" as much as possible.

In the autumn of the third year of Baoyou (1255), Wuliang Hetai led the Mongol army from Yunnan to attack Sichuan, and joined forces with the other two Mongol armies in Hezhou, intending to uproot Diaoyu City, but failed and retreated.

In the spring of the fifth year of Baoyou (1257), Möngke officially launched the war. On the one hand, Meng Ge attacked Sichuan with an absolute superiority of troops and besieged Diaoyu City, and successfully mobilized Lü Wende to come to the main decisive battle. On the other hand, Tachar led the Eastern Route Army to attack Xiangfan, but he could only retreat after a long attack, so Meng Ke reappointed Kublai Khan as the commander of the Eastern Route Army.

Kublai Khan chose to bypass Xiangfan, taking Ezhou as the main target, and agreed with Wuliang Hetai to meet Tanzhou. Li Zengbo was defeated, the defenders of Tanzhou held on for more than a month, and Jia Rudao, who guarded Ezhou, resolutely resisted with tens of thousands of old and weak soldiers, resisted many attacks by the Mongolian army, and held Ezhou for several months.

In the summer of the first year of Kaiqing (1259), the Mongolian army was in charge for a long time, the epidemic epidemic in the army, Meng Ge also died in the army (one said that he died in the Song army's artillery), the Western Route Army had to retreat, and Kublai Khan had to lead the Eastern Route Army to withdraw.

After the war, Jia Rudao was promoted to the position of young master and right prime minister with the merit of "rebuilding the royal family", which opened the career of a powerful minister in the Southern Song Dynasty and laid the groundwork for the demise of the Southern Song Dynasty.

The first two wars caused great damage to the economy and finances of the Southern Song Dynasty, and in order to solve the financial crisis, Jia Rudao carried out a series of reforms. Judging from the final results, the reform has brought a lot of money from the people, and temporarily solved the problems of shortage of fiscal revenue and military rations. However, Jia Rudao also took the opportunity of reform to purge dissidents. One of the most important measures in this reform is called the "Intention Act", which is to strictly audit fiscal expenditures and recover illegal expenditures. As a result, Cao Shixiong, Xiang Shibi, Wang Jian (Diaoyu City Guard) and other generals who were at odds with Jia Rudao all suffered major blows, and some even lost their lives.

At the same time, Yu Xing, the envoy of Sichuan, also wanted to use the "plan method" to kill the Zhiluzhou and Tongchuan Road, who were at odds with him, to appease Liu Quan, the deputy envoy, Liu Cheng surrendered to Mongolia and offered the main attack on Xiangfan to destroy the Song Dynasty.

In September of the fourth year of Xianchun (1268), the Mongol army besieged Xiangyang, intending to cut off the east-west connection of the Song Dynasty, which opened the prelude to the Third Song-Mongolian War.

The Southern Song Dynasty sent troops to rescue Xiangyang many times, but it was unsuccessful due to internal friction.

In the first month of the sixth year of Xianchun (1273), Fancheng was lost, and soon, Lü Wenhuan, who had no hope of breaking through, chose to surrender in Kaesong. After Lü Wenhuan surrendered, he surrendered all the way, which greatly damaged the national defense of the Southern Song Dynasty and accelerated the demise of the Southern Song Dynasty. It can be said that from the moment Lu Wenhuan surrendered, the Southern Song Dynasty was basically doomed.

In the end, Jia Rudao was forced to lead a large army to fight, but the people's hearts were scattered, and the Song army in the Battle of Dingjiazhou had elite soldiers and good generals, but it was about to collapse at the first touch.

Some believe that the fall of Xiangyang was the cause of the fall of the Southern Song Dynasty, but in the First Mongol-Song War, Xiangyang fell and did not lead to bad consequences. The Mongol final demise of the Southern Song Dynasty was largely due to the Southern Song Dynasty's own internal friction, and also a large part of the reason was that the war was fought on the territory of the Southern Song Dynasty for a long time, which ultimately weakened the war potential of the Southern Song Dynasty.

The victors, the Mongols, also suffered heavy losses, leading to the expansion of the capitulating Han warlords, laying the groundwork for their expulsion from the Central Plains decades later.

What the protagonist needs to avoid is this kind of lose-lose battle situation where the queen inheritance faction of equal strength competes and consumes.