On this day, 90 years ago, on January 29, 1935 (December 25, 1934, the Central Red Army crossed Chishui four times. The Battle of Taipingdu and the Fourth Crossing of Chishui, one of the ferries for the First Front Army of the Red Army to cross Chishui for the second and fourth crossings, was a famous battle of decisive significance carried out by the Central Red Army on the Long March after the Zunyi Conference. The battle lasted for more than three months from the crossing of Chishui on January 29, 1935, to the successful crossing of the Jinsha River in early May. In this battle, the Red Army implemented a highly flexible and mobile warfare policy. It galloped across the vast areas along the borders of Sichuan, Guizhou and Yunnan, weaving between hundreds of thousands of enemy troops, actively seeking fighter jets and effectively annihilating the enemy. As a result, we got rid of the enemy's encirclement, pursuit and interception, smashed the enemy's attempt to encircle and annihilate the Red Army on the borders of Sichuan, Guizhou and Yunnan, and enabled the Central Red Army to move from passive to active and from failure to victory at the critical moment of the Long March. In January 1935, when the Central Red Army entered the Zunyi area, its number of people had been reduced from more than 80,000 at the time of its departure to more than 30,000, and the enemy situation it faced was very severe. Chiang Kai-shek mobilized troops and gathered hundreds of thousands of reactionary armed forces to encircle the Red Army from all directions. In order to get rid of this passive and dangerous situation, the Central Military Commission decided to take advantage of the enemy's encirclement to command the Red Army to advance southward from Zunyi, prepare to pass through Chishui, cross the Yangtze River from Jiang 'an, Luzhou or Yibin, and carry out a general counterattack from northwest Sichuan. On January 20, the Military Commission issued the "Battle Plan for Crossing the River." On January 29, the Red Army crossed the Chishui River at Tucheng and Yuanhouchang respectively. In order to prevent the Red Army from crossing the Yangtze River north, Chiang Kai-shek urgently dispatched heavy troops to the junction area of Sichuan, Yunnan and Guizhou provinces to contain and tightly sealed off the Yangtze River. It was impossible for the Red Army to cross the river as originally planned. The Central Military Commission made a prompt decision to suspend the plan to cross the Yangtze River north and ordered troops to gather in Tashi (now Weixin), where the enemy was defenced-empty in northeastern Yunnan. Chiang Kai-shek still misjudged that the Red Army would cross the Yangtze River north and ordered the enemy to pursue it. When the enemy's heavy troops approached Tashi, the Central Military Commission took advantage of the relatively empty enemy in northern Guizhou and commanded the Red Army to swing eastward. On February 18, it crossed Chishui twice at Taipingdu and Erlangtan, leaving the besieged enemy behind. In order to mobilize and confuse the enemy and eliminate the enemy during the movement, the Red Army decided to seek opportunities to annihilate the enemy in Zunyi and Renhuai areas. Chiang Kai-shek mistakenly believed that "the Red Army's lingering here is a sign that the general direction is uncertain" and ordered the enemy to accelerate their approach to the Red Army. The Central Military Commission immediately ordered the Red Army to take advantage of the situation to occupy Renhuai. On March 16, it crossed Chishui three times through Moutai and entered the Gulin area in southern Sichuan. At this time Chiang Kai-shek thought that the Red Army was going to cross the Yangtze River north, so he adjusted his deployment to encircle it. The Red Army followed suit and disguised a regiment as its main force to cross the Yangtze River north to attract the enemy to pursue it west. When the enemy's heavy army rushed south of Jichuan, the main force of the Red Army suddenly turned eastward. On the evening of March 21, it passed Erlangtan, Jiuxikou, Taipingdu secretly and quickly, and crossed Chishui four times by surprise. It crossed the Wujiang River south on the 31st, leaving hundreds of thousands of enemy troops north of the Wujiang River. In early May, the Red Army successfully crossed the Jinsha River at Jiao Ping Ferry. At this point, the Central Red Army broke out of the circle of hundreds of thousands of enemy forces chasing and intercepting, and achieved a decisive victory in the strategic shift.