The CPC led the Red Army to break through the encirclement and interception of millions of Kuomintang troops, cross Chishui four times, cross the Jinsha River skillfully, cross the Dadu River by force, fight fiercely in Lazikou, climb mountains and mountains covered with snow all the year round, cross vast grasslands that are inaccessible, overcome the "Left" dogmatism represented by Wang Ming and Zhang Guotao's separatism and other errors, crisscross more than ten provinces, travel 25000 miles, and successfully reach the Shaanxi Gansu Ningxia region, Realized the assembly division of the main force of the Red Army.