[1] Tadamichi's younger brother, Rokuro Kamaya would later graduate from the 14th Class and entered the Marine Corps which would later be known as the Yonezawa Navy.

With the First Sino-Japanese War just around the corner, under the command of Sukeyuki Itō, in July, the first Combined Fleet in the history of the Imperial Japanese Navy was organized and Kamaya was transferred to the staff of the 1st Guerrilla Unit along with Shizuka Nakamura.

During the initial phases of the Russo-Japanese War, Kamaya participated in the Battle of the Yellow Sea, earning the Order of the Golden Kite, 5th Class.

This opinion was partially based on misrepresentation and Kamaya followed the commander's instructions with the Tatsuta staying which resulted in its explosion by a naval mine and choosing the route through which the Shikishima passed.

The Sado Maru discovered the sinking Admiral Nakhimov during the battle as the already had her crew off the ship and the Shiranui conducting rescue operations.

Kamaya brought the Sado Maru alongside the Shiranui to transfer the Russian naval officers and soldiers and dispatched Captain Sukejiro Inuzuka to capture the Admiral Nakhimov.

After the war, Kamaya became the military attaché to Chinese Legation in December and departed from the Imperial Japanese Navy General Staff in June 1906.

He also served as the Chief of Staff of the Yokosuka Naval District and later given command of the Sasebo Reserve Fleet in July 1912.