Trebuchet on walls
I just built stone walls with rounded towers. I then went through each tower and built trebuchets on each. On some of the towers, the trebuchets are at the top as expected. On about half, they are mounted on the walls, on the inside side of the towers. So when they fire, they hurl the stone into the side of my tower. This happened on the two towers for my gate as well and it damages my gate when they fire.