During the Russo-Japanese War, Katō served as chief of staff to Admiral Tōgō Heihachirō on the battleship , assisting in Japan's victory at the Battle of Tsushima. During this time, he suffered from a very weak stomach, and was vomiting as he issued orders throughout the battle, despite having taken large amounts of medication.
During the Russo-Japanese War, Katō served as chief of staff to Admiral Tōgō Heihachirō on the battleship  assisting in Japan's victory at the Battle of Tsushima During this time he suffered from a very weak stomach, and was vomiting as he issued orders throughout the battle, despite having taken large amounts of medication.