Information on the battle of Lanzhou during the liberation war?

During the War of Liberation, the First Field Army of the Chinese People's Liberation Army fought a decisive battle with the Northwest Kuomintang Army in Lanzhou, Gansu. 1949 After the Battle of Fuzhuan in July, Hu Zongnan, director of the "appeasement" office of the Kuomintang in Ann, led his troops to retreat to the Qinling Mountains and its south. In order to prevent the First Field Army of the People's Liberation Army from advancing westward along the Xi 'an-Lanzhou Highway, Ma Bufang, the chief of the Northwest Military and Political Affairs Department, and Ma Hongkui, the deputy chief, led their troops to Lanzhou, Tongxin and its northern area. In mid-August, the second, third and fourth field armies of the People's Liberation Army left Gannan, approached Fuzhou and advanced into central Hunan, directly threatening Guangdong, Guangxi and Sichuan. In North China, the peaceful liberation of Suiyuan Province (now Inner Mongolia) is also a foregone conclusion. The Kuomintang government fled from Taiwan Province, Guangzhou and Chongqing, fantasizing about keeping the four southwestern provinces, rearming and waiting for an opportunity to make a comeback. In urgent need of strategic cooperation between Hu and Ma in northwest China, a "Northwest Defense Conference" was held in Guangzhou to draw up a "decisive battle plan for Lanzhou" in an attempt to attract and consume PLA troops with Ma Bufang's strong city defense and natural barrier of the Yellow River in Lanzhou, together with Ma Hongkui in Ningxia and Hu Zongnan in southern Shaanxi. Lanzhou is the second largest city in the northwest of China, and it is also the seat of the Kuomintang Northwest Military and Political Chief Office. The city is bordered by the Yellow River in the north and mountains in the south. The terrain is dangerous, easy to defend but difficult to attack. Nanshan is surrounded by city walls and permanent fortifications built for many years. The road leading to the city is connected with the main positions, forming a complete defense system. In view of the fact that the outcome of the decisive battle in Lanzhou is the key to its life and death, Ma Bufang defended Lanzhou with about 50,000 men from the 82nd and 129 army of Qin Long Corps, two cavalry divisions and three public security corps, focusing on the key points of Nanshan and the urban area. With 9 1, 120 army and 8 1 army of Ma Hongkui, more than 30,000 people control Jingtai, Jingyuan and Dalachi areas in the northeast of Lanzhou to ensure the safety of Lanzhou's left wing; The newly formed 20,000 cavalry units controlled Lintao and Tao Sha (now Taishi) areas south of Lanzhou, ensuring the right-wing security of Lanzhou. Ma Jiyuan, commander of Qin Long Corps, is in charge of Lanzhou area. On August 4th, Peng, commander and political commissar of the First Field Army, issued an operational order to capture Lanzhou and Xining according to the Central Military Commission's strategic plan for marching to the whole country and instructions for fighting in Lanzhou, determined to contain Hu Zongnan and Ma Hongkui with one force and concentrate superior forces to annihilate Ma Bufang's main force in Lanzhou. Its deployment is as follows: 18 Corps (owed to the 62nd Army) and the 7th Army remain in Baoji and Tianshui areas, and continue to contain the Hu Zongnan Department to ensure the safety of the main left and rear of the field army; 19 The 64th Army of the Corps entered Guyuan and Haiyuan areas to contain the Ma Hongkui Department and ensure the safety of the right-wing main force of the field army; With 1 Corps (owing to the 7th Army) and the 62nd Army passing through Longxi, Lintao, Linxia and Xunhua, they crossed the Yellow River northward to capture Xining, the capital of Qinghai, cut off the retreat of Lanzhou defenders, and were ready to take part in Lanzhou operations at any time; With five troops from the 2nd and 9th Corps (owed to the 64th Corps) 15000 people, we will go west along Anlan Highway in two ways and take Lanzhou directly. On August 9 ~ 12, the regiments of the first field army attacked Lanzhou and Xining successively from Longdong area. On June 4th, 19 Corps liberated Dingxi. On June 6th, 65438, the 2nd Corps captured Yuzhong, 1 Corps occupied Lintao, and Ma Bufang cavalry fled to the west. On the 20th, 1 Corps occupied Le Kang, pushing Linxia. The 2nd and 19 Corps arrived at the periphery of Lanzhou. On 2 1 day, the 2nd and 19 regiments launched an attack on the Nanshan position in Lanzhou with nine regiments, and fought fiercely for two days, with heavy casualties and little progress. Peng immediately decided that all troops should stop attacking, sum up experience and lessons, spy on the enemy's situation, adjust their deployment, improve their tactics and prepare for tackling key problems. On 22nd, 1 Corps invaded Linxia, and Ma Bufang's cavalry troops were scattered. The right wing and rear of the defenders in Lanzhou were threatened, so Ma Bufang dispatched the 8th Division and 14 Division of the cavalry on the north bank of the Yellow River in Lanzhou to defend Xining. The 2nd and 19 corps, after full preparation, launched an attack on Lanzhou defenders at dawn on 25th. After continuous attacks and repeated struggles, they fought fiercely until dusk and captured the main position of Nanshan. The defenders suffered heavy casualties and their defenses wavered. They fled to Lanzhou City, and Ma Jiyuan fled to Xining that night. In the early morning of 26th, the 3rd Army captured the West Gate of Lanzhou, seized the Yellow River Railway Bridge, cut off the defenders' retreat, and launched fierce street fighting with the defenders in the city. Other troops also invaded the city. 1 1, the 4th Army occupied Baita Mountain on the north bank of the Yellow River. 12, the urban defenders were completely eliminated and Lanzhou was liberated. On the 27th, Hu Zongnan led four armies from Longnan to attack Xihe and Lixian in Gansu and Baoji and Guo Town in Shaanxi, in an attempt to seize Baoji and Tianshui, which was repelled by 18 Corps. Ma Hongkui's 8 1 Army withdrew to Ningxia. Ma Bufang 9 1, 120 troops fled to Hexi Corridor. After the liberation of Lanzhou, the 1 Corps (subordinate to the 7th Army) and the 62nd Army continued to March into Xining. From August 28th to September 5th, he crossed the Yellow River in Yongjing, Gansu and Xunhua, Qinghai, liberated Minhe and Hualong successively, and went straight to Xining. The defenders fled along the road. Ma Bufang and Ma Jiyuan fled to Chongqing by plane. On September 5th, 1 Corps liberated Xining. More than 2,000 people from Ma Bufang who fled to Huangzhong and Haiyan defected. In mid-September, the whole territory of Qinghai Province was liberated. During the battle of Lanzhou, including the battle in Qinghai Province, the First Field Army annihilated more than 42,000 Kuomintang troops, thus losing most of the main force of the Kuomintang army in the northwest, opening the door to Ningxia and Xinjiang and laying the foundation for the liberation of the whole northwest.