Immigration officials entered the border.

There is the Great Wall in the north and Liancheng in the south.

"The Great Wall is in the north and Liancheng in the south." If the Great Wall is a fortification in the era of cold weapons, Liancheng in Pingxiang and Longzhou, Guangxi is a fortification in the era of alternating cold and hot weapons. Liancheng was an important frontier of southern Xinjiang in modern China War, which was composed of Dalian in Pingxiang and Xiaolian City in Longzhou. Although not as long as the history and mileage of the Great Wall, their buildings are as luxurious as palaces.

Longzhou is connected with the Vietnamese waterway and is the center of the Sino-Vietnamese border. At the same time, it is also the central contact point of Nanguan, Guanping and Shuikou. It is of great strategic significance to lock three customs in one town, which has been a battleground for military strategists since ancient times. From 65438 to 0885, the anti-French struggle led by Feng Zicai was based in Longzhou. 1930, Longzhou Uprising led by Deng Xiaoping and others, and the headquarters of the Eighth Army was located in Longzhou County.

1885, Su Yuanchun, then the prefect of Guangxi, defeated the French army with Feng Zicai in Zhennanguan.

Su Yuanchun's son Xi is from Yong 'an, Guangxi. Xiang generals in late Qing Dynasty. In the second year of Tongzhi, Wu Tong defected to Xiang, and with Xi Baotian, he suppressed Taiping rebels and became a participant. After leading the troops to suppress the Miao nationality in Guizhou, the officials didn't even look at it. In the Sino-French War, he helped Feng Zicai resist the French army. Make peace and stay in Guangxi. In his later years, due to the gradual relaxation of running the army, he was illegally robbed and stationed in Xinjiang. He died in Dihua on June 1908 at the age of 64.

During the period of 1885- 1903, the Qing court ordered Su Yuanchun to supervise the border defense and defend southern Xinjiang. Su Yuanchun moved Guangxi from Liuzhou to Longzhou. Su Yuanchun personally surveyed the terrain and selected Yuan Geng Village, 2 kilometers northwest of Pingxiang, as the front-line military base and the command center of the former enemy of Guangxi.

Being surrounded by the Rocky Mountains here is naturally dangerous. It is the center of the south gate leading to Longzhou via Pingxiang, and also the throat leading to Longzhou, Chongzuo and Nanning from the south gate.

Su Yuanchun has built eight medium-sized forts on the surrounding hills, which are connected by city walls. The city wall rises and falls along the ridge, which is quite spectacular and is called Dalian City. There are command center buildings under the valley, including magistrate yamen, martial arts school, training ground, Wusheng Temple and God of Wealth Temple.

And dug four big wells-Fukui for soldiers, Lujing for officers, Shoujing for the elderly and Xijing for weddings and funerals. There is a school yard where ten thousand people train, and four rows of houses 30 meters in front of the yamen are barracks.

There is a white jade cave in the back hill of Dalian prefect yamen, which is an important place for Su Yuanchun's military aircraft to cultivate their minds. At that time, he expanded the three caves of Lingming, Lingguang and Zhusha, built stairs, walls, houses, statues, flower beds and fish ponds, and built pavilions and archways.

At the same time, Su Yuanchun also built another Liancheng fortress in the same way in Jiangshan, northwest of Longzhou. Because the fortifications are slightly smaller than Dalian, they are called Xiaolian City. So two lines of defense were formed in the north and south of Longzhou, which could not only defend Longzhou, but also guard the border as an independent military command center.

According to the mountain situation, the 15 turret was built on the five peaks of the main peak, the left and right peaks and the cave in the mountain, and the single and double punching walls connecting the turrets were nearly 6 kilometers long. Beacon tower, Shuaiqi, two city gates and mountain gates, training ground, armory, Lai 'an Pavilion, Xizi Tower, Yuan Chunge, Baoyuan Palace and other facilities.

Longbao, the main peak town, originally housed a German Krupp1.20mm cannon, covering an area of1.925m2.. There are armories and ammunition depots, and grain is stored on the platform, which is integrated with Xia Dong and Shuikoubao, guarding the Nanmen Tunnel and Shuikouguan in Zhennan, becoming a large-scale and magnificent frontier fortress.

Su Yuanchun also opened a Shi Ping in Liancheng Fortress, built shops and theaters, encouraged mainland people to migrate to the frontier, and implemented the policy of immigration to the frontier, making Longzhou the first trading port in Guangxi, thus forming a fully equipped forward command center and a forward supply base.

In order to strengthen defense, Su Yuanchun also built the Great Wall underground in Pinggangling as an underground passage connecting the north and south forts of Pinggangling, with a total area of 1 1,000m. Every 10 meter, there are two outlets connected with the outside world. There are guard rooms, ammunition depots, command rooms, etc. Underground, there is an underground passage in the middle, which leads directly to the Pinghe River on the Sino-Vietnamese border.

The entire underground camp and passage covers an area of tens of acres, criss-crossing, ingenious structure, like an underground maze, known as the most secret underground project in China in the Qing Dynasty. Pinggangling Fort left a glorious page in the War of Resistance Against France and the War of Liberation.

As the largest military fortress in modern Guangxi, it made the French invaders give up their attempt to attack China in Longzhou section of the Sino-Vietnamese border. However, Su Yuanchun did not get the attention of the imperial court. Finally, he was banished to Xinjiang and died in a foreign land because of the phrase "the moon is half bright".

With the passage of time, the smoke and gunfire of history have been exhausted, and the military defense function of large and small cities has faded, but they have left us with the remains of war against aggressors. They witnessed the history of China's military and civilian Qi Xin's resistance to the French invaders.