During the Russo-Japanese War, Okada served as executive officer on a successor of vessels, including the, and "Asahi" before being given his own command, the "Kasuga" on 25 July 1910.
Okada served as executive officer on a successor of vessels. This was including the, and "Asahi" before being given his own command, the "Kasuga" on 25 July 1910. This was during the Russo-Japanese War.