This quest has the potential to be very interesting but it is hindered by some mechanics that make it near impossible. For some reason, if any structure is damaged by your hand, say a stray bullet or explosion hits it, you incur a relation penalty. It is the same if you accidentally hit an ally. This makes it nigh impossible to make it through one wave without taking a huge penalty, let alone five waves of high raid points, without having relations break down entirely. Relational penalties should be disabled while you are actively defending a city, I can't control if the ai sends a load of allies in front of my guns or if they miss and hit a building.