A Japanese fleet under Admiral Sukeyuki Ito was attempting to disrupt the landing of Chinese troops protected by a fleet under Admiral Ting Ju ch'ang. It’s considered a significant beginning for later battles, the so-called dreadnought technology.
"On 16 September the Japanese Navy, having carried out a landing operation at
Chinnampo, was returning to sea. Admiral Ito had with him a powerful force
comprising ten cruisers, a gunboat, an armed merchantman and a flotilla of
torpedo boats. Ito's flagship, the 4,277-ton Matsushima, mounted one 12.5-inch
and eleven 4.7-inch guns, as did her sister ships Itsukushima and Hashidate. The
Fuso and Takachiho carried two 10.2-inch and six 5.9-inch, the 2,200-ton Hiei
one 10.2-inch and two 5.9-inch and the 2,450-ton Chiyoda ten 4.7-inch guns.
Togo's Flying Squadron, the Naniwa, Yoshino, and Akitsushima, were also in