 On September 16, the convoy of five transport ships departed from the Dalian Bay under escort from the vessels of the Beiyang Fleet which included the two ironclad battleships, and .Reaching the mouth of the Yalu River, the transports disembarked the troops, and the landing operation lasted until the following morning.On September 17, 1894, the Japanese Combined Fleet encountered the Chinese Beiyang Fleet off the mouth of the Yalu River.