so - J apan ese ▁War ▁at ▁the ▁Sie ge ▁of ▁Port ▁Arthur ▁to ▁get ▁effect ▁against ▁the ▁Russian ▁Pacific ▁Fle et . ▁ ▁From ▁the ▁ 1 9 2 0 s ▁and ▁ 1 9 3 0 s , ▁many ▁sur plus ▁guns ▁of ▁the ▁Imperial ▁Japanese ▁Navy , ▁which ▁had ▁been ▁made ▁available ▁due ▁to ▁the ▁reduction ▁of ▁capital ▁war ships ▁per ▁the ▁London ▁Naval ▁Tre aty ▁and ▁the ▁Washington ▁Naval ▁Tre aty , ▁were ▁re used ▁in ▁these ▁coast al ▁art illery ▁install ations . ▁ ▁With ▁the ▁approach ▁of ▁World ▁War ▁II , ▁efforts ▁were ▁made ▁to ▁modern ize ▁and ▁strength ▁these ▁coast al ▁batter ies . ▁In ▁particular , ▁at ▁the ▁T aga ▁B atter y ▁in ▁Sa iki , ▁O ita , ▁the ▁E OC ▁ 1 2 - inch ▁ 4 5 - cal ib re ▁naval ▁guns ▁ ▁formerly ▁used ▁as ▁the ▁ ▁main ▁battery ▁of ▁the ▁scra pped ▁cru iser ▁ ▁were ▁installed . ▁During ▁a ▁training ▁exercise ▁in ▁January ▁ 1 9 4 2 , ▁one ▁of ▁these ▁guns ▁expl oded ▁due ▁to ▁a ▁tur ret ▁bre ach , ▁killing ▁ 1 6 ▁men ▁and ▁inj uring ▁ 1 8 ▁others . ▁ ▁All ▁fort ifications ▁were ▁dis m ant led ▁at ▁the ▁end ▁of ▁World ▁War ▁II . ▁ ▁Com ponents ▁of ▁the ▁H ō yo ▁Fort ress ▁ ▁Tak ash ima ▁Site ▁ ▁Tak ash ima ▁No . 1 ▁B atter y ▁( two ▁ 1 2 cm ▁rapid ▁fire ▁guns