, Katō and
Iesato Tokugawa on November 3, 1921, to attend the
Washington Naval Conference. After his commissioning as
lieutenant, Katō served on the
corvette in 1887, followed by the
cruiser . During the
First Sino-Japanese War, he served in a combat position as gunnery officer on the cruiser . After the end of the war, he served in numerous staff positions before promotion to
commander. He was
executive officer on the
battleship , and
captain of the . He was promoted to
rear admiral on 1 September 1904. 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. Katō became Vice Minister of the Navy in 1906, and was promoted to
vice admiral on 28 August 1908. In 1909, he was appointed commander of the
Kure Naval District, and in 1913 became
Commander in Chief of the
Combined Fleet. Katō became
Minister of the Navy in August 1915, days before his promotion to full
admiral on 28 August 1915. He served in this post in the cabinets of
Ōkuma Shigenobu,
Terauchi Masatake,
Hara Takashi, and
Takahashi Korekiyo. Under Hara and Takahashi, Katō was Japan's chief commissioner
plenipotentiary to the
Washington Naval Conference, and worked with Ambassador
Shidehara Kijurō in the negotiations that led to the
Five-Power Treaty. ==Premiership (1922–1923)==