四国 しこく艦隊 かんたい下関 しものせき砲撃 ほうげき事件 じけんであれば
shikoku kantaishimono sekihōgekijikendeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 四国艦隊下関砲撃事件

1. If the Shimonoseki bombardment incident of the Shikoku Fleet had occurred; Had the Shimonoseki bombardment incident of the Shikoku Fleet happened

Ba Conditional