Second Sino-Japanese War Taishō period Shōwa period Asia-Pacific Mediterranean and Middle East Other campaigns Coups The Battle of Mount Song (traditional Chinese: 松山戰役; simplified Chinese: 松山战役; pinyin: Sōng Shān Zhànyì), also known as the Battle of Ramou (拉孟の戦い), in 1944 was part of a larger campaign in southwest China during the Second World War.

Constructing a series of tunnels and bunkers over a static two-year period they turned the mountain and its immediate environs into a fortress.

The Chinese forces were unaware of the depth of the Japanese defences, and their underestimation led to heavy casualties through a slow and cautious campaign.

After three months of battle, the Chinese forces finally retook Mount Song through the use of extended bombardment and an overabundance of US aid and training, as well as several tons of U.S. TNT placed in tunnels beneath the fortifications.

Although defeated, the small Japanese force, unsupplied and lacking air power or heavy artillery, held up the entire Chinese Expeditionary Army for over three months considerably lengthening the war in Burma.