"Leading the land" was different from other SLG games, where players could not move cities at will.
This was because the Alliance master's city was too important. If the other party had spent so much effort to attack the Alliance master's city, only for the Alliance master to spend money to move the city away, there would be no strategy at all.
In "leading the land by the shore", if one wanted to move a city, they had to build a sub-city in advance, and the main city could only move to the place where the sub-city was.
This was a protective measure for the Alliance master, and it was also a countermeasure for the enemy. In any case, if they found out that you were building a sub-city, they could just stop you in advance.