Wu River (Yangtze tributary) in the context of Anshun

The Long March (Chinese: 长征; pinyin: Chángzhēng; lit. 'Long Expedition') was a military retreat by the Chinese Red Army and Chinese Communist Party (CCP) from advancing Kuomintang (KMT) forces during the Chinese Civil War, occurring between October 1934 and October 1935. About 100,000 troops retreated from the Jiangxi Soviet and other bases to a new headquarters in Yan'an, Shaanxi, traversing some 10,000 kilometres (6,000 miles). About 8,000 troops ultimately survived the Long March.

After the defeat of the Red Army in Chiang Kai-shek's Fifth Encirclement Campaign, on 10 October 1934 the CCP decided to abandon its Jiangxi Soviet and headquarters in Ruijin, Jiangxi. The First Front Red Army of some 86,000 troops headed west, traveling over the rugged terrain of China's western provinces, including eastern Tibet. The Red Army broke several of Chiang's blockades with heavy losses, and by the time it crossed the Xiang River on 1 December had only 36,000 men left. Its leaders, including Comintern military adviser Otto Braun and Moscow-trained Bo Gu, decided to take the troops through Hunan, but Chiang set up defenses to block their way. Mao Zedong, who was not a member of the Politburo, suggested going through Guizhou instead, which was accepted. On New Year's Day 1935, the Red Army crossed the Wu River, and a week later held the Zunyi Conference, which reduced Soviet influence in the Politburo and established Mao's position as de facto leader.

Guiyang is the capital of Guizhou province in the People's Republic of China. It is centrally located within the province, on the eastern part of the Yunnan–Guizhou Plateau, and sits on the north bank of the Nanming River, a tributary of the Wu River. The city is situated at an elevation of approximately 1,100 meters (3,600 ft) and covers an area of 8,034 square kilometers (3,102 sq mi). According to the 2020 census, Guiyang had a total population of 5,987,018, with 4,506,134 lived in its six urban districts.

Guiyang has a humid subtropical climate and is surrounded by mountains and forests. The area has been inhabited since at least the Spring and Autumn period and officially became the provincial capital in 1413, during the Ming dynasty. The city is home to a significant Miao and Bouyei ethnic minority population.