The Battle of Lanfeng (兰封会战) was part of the larger campaign for Northern and Eastern Henan (February 7 – June 10, 1938) and was occurring at the same time as the Battle of Xuzhou (Late December – Early June 1938).
Hsu Long-hsuen and Chang Ming-kai, History of The Sino-Japanese War (1937–1945) 2nd Ed., 1971. Translated by Wen Ha-hsiung, Chung Wu Publishing; 33, 140th Lane, Tung-hwa Street, Taipei, Taiwan Republic of China, page 230-235, Map. 9-2
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