During the Russo-Japanese War, Kasagi was active from its base in Korea in the Battle of Port Arthur. On 9 February 1904, she was part of the 3rd Cruiser Squadron under the overall command of Admiral Dewa Shigetō which engaged the Russian fleet at the entrance to Port Arthur, taking some minor damage.
During the Russo-Japanese War, Kasagi operated from its base in Korea during the Battle of Port Arthur. On February 9, 1904, it was part of Admiral Dewa Shigetō's squadron and engaged the Russian fleet at Port Arthur's entrance, experiencing some minor damage.