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In the late 16th century through the beginning of the 17th, a large chain was at times extended across the harbor, between the two fortresses, to block pirates or other ships from entering the harbor. By [[1609]], cannon were mounted at each of the two fortresses as well.<ref>Turnbull, Stephen. ''The Samurai Capture a King: Okinawa 1609''. Oxford: Osprey Press, 2009. p26-27.</ref>

In the late 16th century through the beginning of the 17th, a large chain was at times extended across the harbor, between the two fortresses, to block pirates or other ships from entering the harbor. By [[1609]], cannon were mounted at each of the two fortresses as well.<ref>Turnbull, Stephen. ''The Samurai Capture a King: Okinawa 1609''. Oxford: Osprey Press, 2009. p26-27.</ref>

Nothing survives of Yarazamui gusuku today.

The fortress was demolished by the American Occupation forces in the early years after World War II, and nothing survives of Yarazamui gusuku today.<ref>Plaques at Onoyama Park, Naha.[https://www.flickr.com/photos/toranosuke/9529342472/sizes/l]</ref>

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