Introduction to "Farewell": Shows the birth of the Fourth Red Army and the construction and development of the base area. The soldiers and civilians in the base area launched four anti-"encirclement and suppression" struggles against powerful enemies, and won three consecutive victories in the anti-"encirclement and suppression" struggle. , established a red regime with an area of 40,000 square kilometers, 3.5 million people, and 26 counties, and became the second largest revolutionary base in Hubei, Henan and Anhui after the Central Soviet Area.