Zhong Yilong, a 91-year-old retired cadre, introduces the history of Songmaoling battle in front of the unknown martyr tomb at the Changketou Village of Nanshan Town in Changting County, southeast China's Fujian Province, June 16, 2019. Since 1953, Zhong Yilong collected the names of martyrs who participated in revolution from 1928 to 1934. He also set up an exhibition regarding the Red Army at his ancestral house several years ago to pass the history down. (Xinhua/Wei Peiquan)