Good day! I would like to suggest something concerning the fortifications. As we all know the towers-the active fortifications can be build at level 1 and after that upgraded when the certain level of Stymphalos is reached. And that is good because the towers become much more effective at level 5,BUT what about the ordinary walls and gates. I can't upgrade them to a new level. And what will happen now I ask? Will I have to remain with my level 1 fortifications. Please make it possible for such structures-walls and gates to be upgraded.