The Battle of Shanghai, "Aka Battle" of Songhu was one of the bloodiest battles of the entire war.
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During the three-month battle, Chinese and Japanese troops fought in downtown Shanghai, in the outlying towns, and on the beaches of the Jiangsu coast. The casualty rate of Chinese army group was more than fifty percent. On October 25 1937, Chinese troops withdrew from downtown Shanghai, which they had held for almost three months. (Wikipedia.en)