"Blooded Alone Brigade" introduction: It shows that after the main force of the Fourth Red Army was forced to march westward due to the failure of the fourth anti-"encirclement and suppression" campaign, the 25th Red Army rebuilt itself to fight side by side with the people in the base area and continued to carry out anti-"encirclement and suppression" campaigns. Struggle, adhere to the struggle in the base area, carried out the Long March in the past two years, and became the first Red Army Long March team to arrive in northern Shaanxi. After the Long March of the Red 25th Army, the 28th Red Army was rebuilt and persisted in the arduous three-year guerrilla war in the base area. The troops were ordered to be reorganized into the fourth detachment of the New Fourth Army and sent to the anti-Japanese front lines in central Anhui and eastern Anhui.