the city of tina and kawa

I've made up two islands that are at war the Tina vs Kawa the reason is that the Tina caught Kawa miners stealing from the Tina mine and Kawa started to break very important promises so they declared war they fought for two years until the Tina took a ancient underground tunnel to port Kawa and disguised themselves as port Kawa fisher men then took a boat over to Kawa mine and took another ancient underground tunnel to the cellar of caslte Kawa then went up to throne room and took there emperor hostage they ransomed him back for the end of the war.