During the Sino Japanese War, the Japanese Imperial Navy placed a submarine mine control station and cannons on the right wing, but these were removed after the end of the war.
Later on, the basic construction of the No.2 Kaiho was resumed, and a 15-cm cannon was placed on the west end.
Bricks with several different engravings have been found at No.2 Kaiho, including an engraving of the shape of a cherry blossom.
