1936年2月20日至5月5日,经过长征到达陕北的中国工农红军第一方面军,在毛泽东、彭德怀统帅下,组成中国人民红军抗日先锋军,由陕北清涧县河口、绥德县沟口等地强渡黄河,进入山西,进行了为时75天的东征战役。红军东征,是中国共产党及其领导的军队准备大规模的抗日战争的重大军事? From February 20 to May 5, 1936, the First Front Army of the Red Army of Chinese Workers and Peasants, who arrived in northern Shaanxi through the Long March, formed the vanguard anti-Japanese pioneer army of the Chinese People’s Red Army under the command of Mao Zedong and Peng Dehuai. From the estuary of Qingjian County in northern Shaanxi, De County, Mizoguchi and other places to force the Yellow River into Shanxi, conducted a 75-day Eastern Campaign. The Great Eastward Marching of the Red Army is a Major Military for the Chinese Communist Party and Its Leading Armed Forces to Prepare Large-scale Anti-Japanese War?