After the Long March drew to a close, the Red Army established its base in northern Shaanxi, but soon faced severe economic blockades and supply shortages. To break the stranglehold, revolutionary forces turned to a vast stretch of untamed wilderness south of Yan'an, where they reclaimed farmland and achieved self-sufficiency through backbreaking labor. CGTN's Chen Lanyou travels to Nanniwan to revisit parts of this history.