Background
Kozo Tsuboi was born on the 7th of March, 1843 in Choshu, Japan. Tsuboi Kozo was born as Hara Kozo, the second son of a doctor in what is now part of Hofu, Yamaguchi, and was adopted into the Tsuboi family as a child.
航三 坪井
Kozo Tsuboi was born on the 7th of March, 1843 in Choshu, Japan. Tsuboi Kozo was born as Hara Kozo, the second son of a doctor in what is now part of Hofu, Yamaguchi, and was adopted into the Tsuboi family as a child.
As a Choshu Domain samurai he took part in the defense of the city during the bombardment of Shimonoseki by European warships from September 5-8, 1864. Witnessing firsthand the firepower and devastation caused by a relatively few western warships, Tsuboi became convinced Japan must also obtain this weaponry to survive. He enlisted in the Choshu domain navy later that year and served aboard the Kigai-maru while studying the English language and navigation at the Choshu Naval School.
Serving on five Choshu domain ships between 1866 and 1868, Tsuboi assisted in transporting imperial soldiers on the Inland Sea during the Boshin War of the Meiji Restoration against the Tokugawa shogunate, and was later officially commissioned a lieutenant in the newly established Imperial Japanese Navy in 1870, and assigned to the screw sloop Hosho.
He became executive officer of the ironclad warship Kōtetsu in 1871. That same year he received training on board the flagship USS Colorado of the American Asiatic Squadron and was sponsored by Admiral John Rodgers to attend Columbia University from April 1872 until July 1874.
Returning to Japan in 1874, Tsuboi was promoted to lieutenant commander. His first command was as captain of the Teibo from August 3, 1874. From 1875 through 1879, he surprised warship construction at the Yokosuka Naval Arsenal.
In command of the Readiness Fleet during the First Sino-Japanese War, Tsuboi was at the Battle of Pungdo in command of the Yoshino, and later won distinction at the Battle of the Yalu on September 17, 1894, where (as commander of the Flying Squadron), he displayed innovative tactics and aggressive maneuvers against the Chinese Beiyang Fleet.
A national hero following the war, Tsuboi was ennobled with the title of danshaku (baron) under the kazoku peerage system on August 20, 1895, and promoted to vice admiral the following year. In 1896 he was made Commander in Chief of the Readiness Fleet, and in 1897, Commander of the Yokosuka Naval District.
