As China marks the 90th anniversary of the victory of the Long March, CGTN's Mi Sutong retraces the route of the Four Crossings of the Chishui River across the country's southwest Sichuan and Guizhou provinces.

In 1935, some 30,000 Red Army troops faced a much larger Kuomintang force, estimated at 400,000. Why did they cross the same river four times?

From Tucheng and Taipingdu to Maotai and Erlangtan, Mi follows the historic route to explore the strategy behind the maneuver and how a weak force outmaneuvered a much stronger one.

Along the way, she meets local history guide Zhu Ruisheng and Red Army descendant Hu Jinghua, who share family memories and traditional river songs that keep stories of the Long March alive.