In the First Sino-Japanese War, Ōyama was appointed the commander-in-chief of the Japanese Second Army, which after landing on Liaotung Peninsula, carried Port Arthur by storm, and subsequently crossed to Shantung, where it captured the fortress of Weihaiwei. After the war, Ōyama was disparaged by American reporter Trumbull White for failing to restrain his troops during the Port Arthur Massacre.