Dragon Moon Island has never fallen, which is beyond the expectations of most people.
From start to finish, it is the only overseas island of the Eastern Country, and even though it is fairly close to the mainland, it still means it might face encirclement on all sides.
Once the sea and air reinforcements are cut off, it can be starved to death.... The Foreign Invader alliance indeed did just that.
After taking down Sakura Island in the East Sea region of the Eastern Country as a frontline base, if they also capture the lone island in the South Sea, it would mean completely sealing off the Eastern Country by land, and at the same time, they could also use Dragon Moon Island as an outpost base, threatening the entire South Sea of the Eastern Country..... However, this is actually not the most important point.
