The Battle of Lake Khasan (29 July – 11 August 1938), also known as the Changkufeng Incident (Russian: Хасанские бои, Chinese and Japanese: 張鼓峰事件; Chinese pinyin: Zhānggǔfēng Shìjiàn; Japanese romaji: Chōkohō Jiken) in China and Japan, was an attempted military incursion by Manchukuo, a Japanese puppet state, into the territory claimed and controlled by the Soviet Union. That incursion was founded in the Japanese belief that the Soviet Union had misinterpreted the demarcation of the boundary based on the Treaty of Peking between Imperial Russia and Qing China and the subsequent supplementary agreements on demarcation and tampered with the demarcation markers. Japanese forces occupied the disputed area but withdrew after heavy fighting.
Size 35× 35 mm.
Weight 19.3 g.
Reverse
張鼓峰事件戦捷記念 - Changkufeng Incident Сommemorative
山兵砲等二十五聯隊 - 25th Regiment of Mountain Artillery
昭和十三年ハ月十二日 - August 12, 1938
"On July 29-31, 1938 the 75th infantry regiment of the 19th infantry division of the japanese armey supported by border guards, the 25th mountain artillery and 19th engineer regiments drived out the soviet border guards and two reinforced battalions of the 118th and 119th infantry regiments regiments of the 40th Infantry Division of the 1st (Primorskaya) Army of the Far Eastern Red Banner Front, occupied the Zaozernaya, Bezymyannaya and Machine-Gun Hill heights located on the Soviet-Manchurian border, in the most remote part of the Posyetsky District, behind which lay Lake Khasan ..."
Another specimen.