Battle of the Yalu River, the largest naval engagement of the First Sino-Japanese War.

The Battle of the Yalu River was the largest naval engagement of the First Sino-Japanese War, and took place on 17 September 1894, the day after the Japanese victory at the land Battle of Pyongyang. It involved ships from the Imperial Japanese Navy and the Chinese Beiyang Fleet.

The First Sino-Japanese War, or the First China–Japan War, was a conflict between the Qing dynasty of China and the Empire of Japan primarily over influence in Korea. In Chinese it is commonly known as the Jiawu War. After more than six months of unbroken successes by Japanese land and naval forces and the loss of the ports of Lüshunkou and Weihaiwei, the Qing government sued for peace in February 1895 and signed the unequal Treaty of Shimonoseki two months later, ending the war.