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

Qingpingle Liupanshan Mountain. 1In August, 935, after smashing the route of Zhang's separatist party and the Red Army, Chairman led the Red Army to continue to advance to the northern Shaanxi base area. 1935 In mid-September, 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, showing off eastward, and then unexpectedly turned around from Hadapu and marched northward, conquering Tongwei City and entering Pingliang and Guyuan Avenue. 1935 10 10 On 7 October, the Red Army defeated the intercepted enemy cavalry regiment in Qingshizui, Liupanshan, Ningxia, clearing the obstacles and getting rid of chasing the enemy. In the afternoon, the Red Army rallied and crossed Liupan Mountain. After that, they kept moving forward and arrived in Wuqi (now Wuqi County), 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 Liupanshan" is Mao Zedong's masterpiece when he crossed Liupanshan. "The top of Liupan Mountain is covered with red flags and westerly winds. "The red flag flutters like a fire on the top of the high Liupanshan Mountain, showing the victory joy of the Red Army soldiers. As a symbol of revolution, "red flag" appears repeatedly in Mao Zedong's poems: "A flag can be seen at the foot of the mountain"; "Red flag jumps over Tingjiang"; "Under the mountain, the wind is red and picturesque"; "The wind swept the red flag over the mark"; "Arouse millions of workers and farmers to work together to avoid red flags and chaos. "Mao Zedong and the Red Army of Workers and Peasants led by him held this red flag to create the Jinggangshan revolutionary base and won revolutionary victories again and again. Today, this red flag is displayed 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.