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Just when Zhao Zhenzhong ordered all units of the Guards to enter the state of war and be ready to attack all forces entering the Guards' controlled areas at any time, the battle situation in southern Shandong changed dramatically from late June to mid-July, and the Guards benefited a lot from it.

After Chiang Kai-shek ordered the capture of important places in southern Shandong on June 23, the ministries carried out combat operations in accordance with the orders.

The Liu Zhi unit of the second division of the First Army under Jiang, the Wei Lihuang unit of the 14th Division, and the Chen Cheng unit of the 21st Division was ordered to retreat south to cope with the upcoming eastern expedition of the Wuhan National Government. Jiang himself also returned to Nanjing to deploy the response.

Except for Linyi, a strategic location, which was difficult to conquer, all the other units made progress. Among them, Chen Tiaoyuan's unit, the 37th Army, who was responsible for attacking Fei County, cut off the retreat route of Linyi defenders and blocked the arrival of their reinforcements, made smooth progress. Under the guidance of the remaining Red Gun Association personnel suppressed by Zhang Zongchang, the Chen Tiaoyuan's unit occupied Fei County on June 25.

During the Republic of China, the area of ​​Fei County was much larger than that of Fei County in later generations. Its county area includes all the areas of Fei County and Pingyi County in later generations. From the geographical perspective, Fei County is high mountains on the north and south sides, and the entire county is high in the northwest and low in the southeast. The county is adjacent to Mengyin County in the north, the Zaozhuang and Jinpu Roads in the south, and the Mengshan Mountain is separated from Mengshan to the west. The remnants of Nishan Mountain face Sishui, and there is a plain between the east and Linyi. Fei County is located on the main transportation route connecting Teng County and Linyi.

While the Northern Expedition Army launched an offensive from the south and occupied Liguoyi and Yixian County, cutting off the possibility of Zhilu coalition forces reinforcing Linyi along the Jinpu Road branch line, Lai Shihuang of the 14th Army and Cao Wanshun of the 17th Army went east of Linyi, attacked north along the highway from Gaomi to Xuzhou, blocking the passage of Sun Chuanfang's troops to the south to support Linyi.

Through Sishui, Fei County's passage to assist Linyi was cut off by Chen Tiaoyuan's troops, and Zhang Zongchang's troops in Linyi were surrounded by numerous encirclements. In addition to forcibly breaking through the blockade line of the Northern Expedition Army to cross the Yang River, and through Xiachengyi to Mengyin or Yishui, there was still a way to survive, other sides were covered with heavy troops of the Northern Expedition Army.

However, the Northern Expedition Army's attack on Linyi was also extremely unsuccessful. Linyi is located in the intersection of the Yang River and the Yi River, which is easy to defend but difficult to attack. The defenders deployed by Zhang Zongchang in Linyi used the two natural moats, the Yang River and the Yi River, together with the originally built solid fortifications, which caused great damage to the Northern Expedition Army.

Faced with the unfavorable situation of attacking Linyi, after occupying Fei County, Chen Tiaoyuan's troops not only stepped up the construction of fortifications to defend, but also sent forces to reconnaissance in the hope of crossing Mengshan and capturing Mengyin and Yishui to further cut off the retreat of the Linyi defenders and disintegrate their will to combat.

Just when Linyi was unable to be siege, on June 27, the first division of Deng Zhenquan's unit of the First Army, who participated in the Linyi attack operations, and Gu Zhutong's unit of the Third Division were ordered to be transferred south. The defense line after the transfer of the unit was taken over by Ye Kaixin's unit of the 44th Army. At this point, Jiang's first direct army of Huangpu was withdrawn from southern Shandong, leaving only Bai Chongxi, the acting commander-in-chief of the Second Route Army of the Northern Expedition Army, commanding the Guangxi troops and horses and other miscellaneous teams to fight to death in the Shandong-Zhi-Lu coalition forces.

Because Linyi is easy to defend and difficult to attack, the two divisions of the First Army that participated in the attack on Linyi were transferred again, and Chen Tiaoyuan's troops were in Fei County, leaving only Ye Kaixin's 44th Army on the frontal attack on Linyi.

Ye Kaixin's troops originally belonged to the Hunan Army. After defeating Yuezhou in March 1926, they defected to the Zhili Wu Peifu and became the commander-in-chief of the Hunan Army, the anti-Tang Shengzhi's "Anti-Bandit Alliance" of the Hunan Army. After the Northern Expedition Army conquered Wuhan last fall, Ye Kaixin's troops were reorganized into the 44th Army of the National Revolutionary Army. Zhang Zongchang's Zhili coalition has had close contact with Wu Peifu since the Luyu War. Zhang even provided a lot of convenience to Wu Peifu in terms of arms and supplies. Ye Kaixin's troops have benefited from it, and they have some incense.

In addition, the only one of the people involved in the besieging Linyi was left, Ye Kaixin also had his own plans in his mind: "You, Jiang, transferred all your direct descendants, and Bai Chongxi took good care of the Guizhou clan. Together, I, Ye, took my brothers to chew hard bones here? I am not so stupid." Therefore, when Ye Kaixin's army took over the frontal defense of the besieging Linyi, he became passive and lazy in fighting. Often there were guns and cannons rumbling and shouting to kill, but most of them were thunder and rain.

Just as Ye Kaixin's troops were dealing with their responsibilities, the other groups of people were each awarded. On June 28, Wang Tianpei's troops received the help of the remnants of the local Red Gun Association and occupied Teng County and arrived in Jiehe. Ma Yuren's troops of the 12th Army of the Zhilu coalition surrendered; Ma Xiangbin's troops of the 11th Army captured Shan County; Lai Shihuang's troops of the 14th Army occupied Ju County; Cao Wanshun's troops of the 17th Army occupied Rizhao.

At this time, Mr. Jiang was full of bitterness. He had just transferred two divisions of his first army, the war in southern Shandong to the south on the grounds of preventing the eastern expedition of the Wuhan National Government. Unexpectedly, the battle in southern Shandong made such progress the next day. Now, I am afraid that the power of the Guangxi clan will expand again, so I still have to think about it and suppress it.

On July 3, Chiang Kai-shek changed Bai Chongxi's original combat plan on the grounds that the Wuhan army went east and Linyi could not capture it for a long time. He changed Bai Chongxi's original combat plan on the name of Commander-in-Chief of the Northern Expedition Army. Wang Tianpei was in charge of the tenth and the 33rd Army defended Lincheng; one of the first army, the third division guarded Zaozhuang; the 17th Army guarded Haizhou; the 37th Army guarded Tancheng; the First Route Army retreated from the south of the canal, and the Third Route Army retreated from the Jinpu Road to the upper reaches of the Yangtze River.

This adjustment changed the original attack and combat situation of the Northern Expedition Army, and changed from attack to on-site defense, giving Zhang Zongchang and Sun Chuanfang a chance to breathe.

After receiving the order to retreat south, Xia Wei, the general of the Guangxi clan who was then the deputy commander of the Seventh Army and the commander of the First Division, rushed to Bai Chongxi's command center and asked: "General, what does this mean by Jiang? Brothers beat him to death. Seeing that Zhang Zongchang and Sun Chuanfang could not hold on, they could recover Shandong after working hard. Now, they ordered us to retreat south and go to the upper reaches to prevent the Wuhan troops. Jiang transferred all his direct troops and did not place them upstream, and now let us go to the upper reaches again?"

"Xu Cang, pay attention to your words!" Bai Chongxi reminded him sternly. Then he sighed and said, "What else can he mean by Jiang? Isn't he just afraid that our Guangxi troops will expand and that Jiang's position will be unstable?" Bai Chongxi is so smart. The southern army is somewhat insufficient in Wuhan's army, but there is no need to make the progress better to capture Rizhao, Ju County, Lincheng and other places. All the troops are transferred south and heading to the upper reaches of the Yangtze River to face the Wuhan army. Jiang is taking the opportunity to weaken the Guangxi army, and the other troops have just become the company of the Guangxi army.

"Our Guangxi troops were expanded by oneself. In the Northern Expedition, Mr. Jiang always put his Huangpu clan in the back position. He could not win the results. If he expanded slowly, who would blame him? If Mr. Jiang could let his direct line fight first, no matter how much he expanded, I would be convinced! What is his ability to rely on such tricks?!" Xia Wei said angrily.

"Okay! Don't say that these are useless, go back and control the troops and act according to the orders!" Bai Chongxi shouted, "Remember, Mr. Jiang is now the commander-in-chief of the Northern Expedition Army and has the right to adjust the combat deployment. It is not the time for us to conflict with Mr. Jiang."

Just when Bai Chongxi forwarded Chiang Kai-shek's orders to various ministries, the Chen Tiaoyuan tribe of the 37th Army did not receive the order because it was interspersed in Mengshan. On July 6, under the guidance of local guides, Chen Tiaoyuan tribe crossed Mengshan from a small road and occupied Mengyin County in one fell swoop.

Just as Chen Tiaoyuan was sending back the good news and preparing to further attack Yishui, the orders of Chiang Kai-shek and Bai Chongxi arrived.

On July 10, Bai Chongxi, commander-in-chief of the Second Route of the Northern Expedition Army, failed to face the Jinpu Road and Linyi failed for a long time, so he ordered the siege to withdraw. He ordered Ye Kaixin and other troops of the 44th Army to advance to Yixian County and Zaozhuang to help Lincheng; and ordered Chen Diaoyuan troops of the 37th Army to give up Fei County in Mengyin.

After receiving the order issued by Chiang Kai-shek on July 3 to let the 37th Army guard Tancheng and Bai Chongxi on July 10 to give up Mengyin and Fei County, Chen Diaoyuan angrily cursed, "What's the matter with this damn thing?" and he had no choice but to execute the order. Chen Diaoyuan knew that Jiang and Bai had a good time to part with each other, and that his little arms and legs would be better to be at peace with oneself.

Since the Northern Expedition Army turned into the defensive situation, the Zhilu coalition would naturally not miss such a good opportunity. On July 5, Xu Yuanquan, the Sixth Army of the Zhilu coalition Army, Cheng Guorui, the Third Army, and Wang Dong, the Fifth Army, launched a large-scale counterattack and reoccupied Lincheng, Teng County. At this time, Wang Tianpei, the 10th Army of the Northern Expedition Army, who was responsible for the defense of this area, had to retreat to the south bank of the Hanzhuang Canal because his subordinates were seeking wages.

Subsequently, the attack and defense between the Northern Expedition Army and the Zhilu coalition Army was easy to attack. Under the command of Chu Yupu and others, the Zhilu coalition Army continued to attack, while the Northern Expedition Army resisted step by step. By July 24, the Zhilu coalition Army Xu Yuanquan, Xu Kun and other troops occupied Xuzhou, Wang Tianpei's army retreated to Suzhou, and the Second Route Army also retreated from Zaozhuang to Taierzhuang and set up defenses against Xuzhou.

Seeing this situation, Chiang Kai-shek rushed to Bengbu and worked with Bai Chongxi's troops to plan to retake Xuzhou to restore the decline. The battle for Xuzhou, commanded by Chiang Kai-shek, took four days from July 31 to August 3, and finally ended with the failure of the Northern Expedition Army. After Chiang Kai-shek returned to Nanjing on August 6, he was sent off on August 12 due to the forced palace of Li Zongren, Bai Chongxi and others. However, before leaving office, Chiang detained the commander of the 10th Army for charges such as "collusion with Tang Shengzhi, retreating without authorization and deducting wages", and then shot him on August 11. Wang Tianpei was the scapegoat who failed in the Northern Expedition.

Just in mid-July, shortly after Chen Tiaoyuan's tribe was ordered to evacuate from Mengyin, Zhao Zhenzhong issued an order on July 14, ordering Zhang Mingrui's tribe to occupy Mengyin County, control all traffic roads, and complete corresponding defense tasks; ordering Gu Haichuan's tribe to further expand the control area eastward and southward, control Xiachengyi, Qingtuo and other traffic roads entering the Yimeng Mountains from Linyi, and complete corresponding defense tasks; ordering Liu Jifeng's tribe to cooperate with Gu Haichuan's tribe to further compress the sphere of influence of Yishui County's government and limit it to 15 kilometers around Yishui County; other departments should strictly prevent the defeated soldiers or other forces entering the control area, and all those who refuse to surrender can be wiped out.

The Northern Expedition Army and the Zhilu coalition fought to the death in the southern part of Shandong for more than a month, but in the end, Zhao Zhenzhong's escort army took the opportunity to get a bargain. Not only did Zhao Zhenzhong's command headquarters occupy Mengyin County, but further expanded the territory of the escort army, but more than 1,400 defeated soldiers from the Northern Expedition Army and Zhilu coalition Army were arrested in more than a month. After strict review and identification by the Investigation Office of the Guard Headquarters, in addition to executing some people who were defeated and burned, killed, plundered and plundered among the people nearby and were extremely vicious, the remaining nearly 1,200 people were sent to labor reform. Under the surveillance and command of the engineering battalion, they were engaged in relevant engineering construction every day.
Chapter completed!