What historical event is described in Red Flag and West Wind?

Qingpingle Liupanshan Mountain. 1In August, 935, after Chairman Zhang split the party and split the route of the Red Army, he led the Red Army to continue to advance to the northern Shaanxi base area. 1In the middle of September, 935, the Red Army conquered the natural barrier Lazikou, miraculously crossed the Minshan grassland and entered Longnan. 1935, 10 At the beginning of the year, on the one hand, the Kuomintang mobilized heavy troops to "surround" the revolutionary base areas in northern Shaanxi, on the other hand, it established a defense line around Liupanshan in an attempt to surround the Long March Red Army. Under the command of Mao Zedong, the Chinese Red Army of Workers and Peasants pretended to attack Tianshui and took it by surprise from the east. Then, by surprise, it turned around from Hadapu and marched north, conquered Tongwei City and entered Pingliang and Guyuan Avenue. 1935 10 10 On 7 October, the Red Army defeated the intercepted enemy cavalry regiment at Qingshizui, Liupanshan, Ningxia, cleared the obstacles and got rid of the enemy's pursuit. In the afternoon, the Red Army rallied and crossed Liupan Mountain. Then go straight and arrive at Wuqi (now Wuqi County) in Baoan County, northern Shaanxi on June 1935 19. They joined forces with the Red Army in northern Shaanxi and completed the 25,000-mile long March that shocked the world. This song "Qingpingle Liupan Mountain" is Mao Zedong's masterpiece when he crossed Liupan Mountain. "The top of Liupanshan Mountain is covered with red flags and westerly winds." The red flag flies like fire on the top of Liupanshan Mountain, showing off the victory joy of the Red Army soldiers. As a symbol of revolution, "Red Flag" appears repeatedly in Mao Zedong's poems: "A flag is in sight under the mountain"; Red Flag Crossing the Pavilion River; "Under the mountain, the wind is red and picturesque"; "The wind swept the red flag over the mark"; "mobilize millions of workers and peasants to work together to avoid the red flag falling and chaos." Mao Zedong and the Red Army of Workers and Peasants led by him held this red flag to establish the Jinggangshan revolutionary base area, and won revolutionary victories again and again. Today, this red flag flutters more brightly on the top of Liupanshan Mountain after the bullets, which indicates that the Long March is coming to an end and the China Revolution will turn a new page.