port town of Ningpo during 1938. Japan commenced the strategic bombing campaign against Szechwan and Chungking (1938). Japan communized the blocked of Chinese ports in coastal areas. Battle of Nanchang (March 1939) Battle of Xiushui River Battle of Suixian-Zaoyang Nomonhan Incident against Russians and Mongols (May - Sept. 1939) Treaty of Nomanhan (signing for Russians and Japanese), (September 15, 1939) First Battle of Changsha (September 13, 1939) Retreat of North Hunan Chinese winter operations (November 1939–January 1940) Establishment of the Wang Chingwei regime in Nanking (March 1940) Battle of Chungyang (battle of South Shansi) Battle of Chungtiao Shan Second Battle of Changsha (August–September 1941) Chinese guerrilla offensives (December 8, 1941) Chinese offensive against Canton The first Chinese operations in Burma, Kwangtung (Canton) and Kwangsi. Crossing of Hsingchiang river Crossing of Laotao and Liuyang rivers Third Battle of Changsha The first Chinese operations in Burma in support of the Allies Battle of Toungoo Battle of West Yehta Battle of Yenangyaung Chinese retreat to Yunnan Japanese advance to Yunnan-Burma Road Operations in West Yunnan Battle of Tengchung Battle of Lungling Falling of Burma (June 1942) Battle of Chekiang-Kiangsi (April 1942) Second Japanese Bacteriological air strike by the same unit. They launched bombs in ceramic containers filled with the liquid form of pathogenic agents in the same area mentioned above during 1942. The Japanese planned the Szechwan Invasion (Spring 1942–Spring 1943). The Japanese continued their terror air strike campaign against Chungking and Szechwan (1943). First attempt at putting the plans of the Szechwan invasion to practice Battle of West Hupei (May 1943) The Chinese sent troops bound for Yunnan and India. Battle of Changteh (chemical attacks) Battle of West Hunan Battle of West Hupeh (December 1943) Battle of South Hankow-Peking rail lines (1944) Chinese communist agents made a secret coordination with Japanese secret agents against Chiang Kai Shek units in Szechwan and Kweichow. Japanese operations in April 1944 Battle of Central Honan Battle of Changsha-Hengyang Battle of Kweilin-Liuchow American and Chinese Air forces began one sustained bombing campaign against Japanese airfields, military installations and government properties in Japanese-held territories in the China mainland. Both air forces used medium (B-25 and others) and heavy bombers (B-24) in these air strikes. The USAAF launched the first B-29 air attacks against Japanese territory from Chinese Bases in the south area. The first objective was the Yawata iron factories. These campaigns extended to Manchukuo, Formosa, Chosen, Chinese