Original sentence: Despite being regarded as floating fortresses, they were used as warships in the Seven-Year War with Korea.Turtle ships were put to use once again against the Russian fleet thirty years after the Seven-Year War
Edited sentence: Despite being regarded as floating fortresses, they were used as warships during the Japanese invasions of Korea (1592-1598) with Korea.Turtle ships were put to use once again against the Russian fleet thirty years after the Japanese invasions of Korea (1592-1598)