Thread:JosephHawk/@comment-10809075-20130715041953/@comment-26479628-20130715125624

You ask them so you dont have to kill off their units if they need to occupy something. If I occupied your VF with some of my expensive units, and you killed them, that could start a feud. Its just showing respect t other players. Sometimes when someone occupies me without persmission, and I need the building they are occupying, I ask them to withdraw their troops. But in order to save time, just ask in advance.