Sometimes wars are won by fighting, but sometimes the only way to defeat your enemies is peace. This time, peace kills the Sterlings. These vicious creatures live for fighting. Actually, if they do not fight for a long time, they just die. Your objective is put peace among them before they become a pest. Drag them apart, put hearth walls to keep them from fighting, or even use a gun, but… that is not a good way to maintain peace.