Operation Chahar

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Operation Chahar
Part of Second Sino-Japanese War
Chinese soldiers, pictured by the Great Wall of China in Laiyuan in 1937
Date August 1937 Location Vicinity of Beiping and Chahar – Suiyuan Result Japanese victory
Belligerents
Japan Mongol Military Government  Manchukuo	China
Commanders and leaders
Kiyoshi Katsuki Shigiyasu Suzuki Seishirō Itagaki Hideki Tōjō Demchugdongrub	Tang Enbo Chiang Kai-shek Yan Xishan Fu Zuoyi
Strength
90,000 Kwantung Army troops 60,000 Mongolian and Manchurian troops[1]	unknown
Casualties and losses
unknown	26,000[1]

Operation Chahar (Japanese: チャハル作戦, romanized: Chaharu Sakusen), known in Chinese as the Nankou Campaign (Chinese: 南口戰役; pinyin: Nankou Zhanyi), occurred in August 1937, following the Battle of Beiping-Tianjin at the beginning of Second Sino-Japanese War.

This was the second attack by the Kwantung Army and the Inner Mongolian Army of Prince Demchugdongrub on Inner Mongolia after the failure of the Suiyuan Campaign. The Chahar Expeditionary Force was under the direct command of General Hideki Tōjō, the chief of staff of the Kwantung Army. A second force from the Beiping Railway Garrison Force, later the 1st Army under General Kiyoshi Katsuki, was also involved.