What historical event does this poem refer to: "Blow the horn of the workers and peasants revolution, raise the sickle and axe …"?

The Autumn Harvest Uprising led by Mao Zedong.

"The army is called the workers' and peasants' revolution, and the flag is a sickle and axe ... In the autumn harvest season, there is a gloomy cloud and a vigorous riot." (Quoted from a poem by Mao Zedong 1927) This word eulogizes the Autumn Harvest Uprising (Hunan-Jiangxi Border Uprising).

Autumn harvest uprising:

The Autumn Harvest Uprising was an armed uprising held by the Revolutionary Army of Workers and Peasants (Red Army) led by Mao Zedong in eastern Hunan and western Jiangxi on September 9, 1927. 1September, 927, China * * * Producers Party led an armed peasant uprising on the Hunan-Jiangxi border. After the August 7th meeting, Mao Zedong was appointed by the Central Committee of the Communist Party of China, and went to Changsha as Commissioner of the Central Committee of the Communist Party of China to lead the autumn harvest uprising on the Hunan-Jiangxi border. On August 18, the reorganized Hunan Provincial Party Committee held a meeting in Shenjiadawu, a suburb of Changsha, to discuss and formulate plans for the autumn harvest uprising. At the meeting, Mao Zedong emphasized the idea that political power comes from the barrel of a gun. The meeting decided to draw a clear line with the Kuomintang, called on the masses in the name of China * * * Production Party, and decided to concentrate on launching an armed uprising centered on Changsha in eastern Hunan and western Jiangxi.