旅順港閉塞作戦
With the start of the Russo-Japanese War of 1904–1905, "Takasago" participated in the bombardment of the Port Arthur naval base on the morning following the pre-emptive strike by Japanese destroyers against the Russian fleet in the opening stages of the naval Battle of Port Arthur, serving as flagship for Admiral Dewa Shigeto. The Japanese attack set fire to a portion of the town, and damaged a number of ships in the harbor, especially the cruisers , and , and the battleship .