I understand that you can build three of something to form an army but what if you only want to build one catapult, for instance, and send it to a nearby city. There is a pop up that I've seen in the game that says you need to protect the catapult with other units because of its weak defense but I can't figure out how. Since you can't combine different units into armies how do I protect a catapult with another unit?
I'm sure it's something simple but I can't figure it out.
I'm sure it's something simple but I can't figure it out.