The Navy have their hands full with the warlords and revos. if they send a lot of forces they’re going to risk exposure. A small force is enough, a large force would probably cause a 3 sided war.
I am of the mind that the raid fails here, some people get captured and set for execution in the flower capital just like oden was( a good parallel) only for the marines/Grandfleet/bb busts in there to turn to tides.