Does anybody use forts much? They seem like a good idea in theory, but I've never seen the practicality of them. I usually don't like making them in cities because they take up valuable tiles and when I do make them in my cities just to be safe it seems like I'm waiting around, wasting a unit and a tile for nothing. I've tried using them in the battlefield on neutral sites, but then I run into the problem of them going to waste again or the enemy even just claiming the tile and the fort itself eventually. And, it's not practical once a battle starts because it takes so long to make. The best application I've found is having a ranged unit stand guard in one at a strategic pinch point that's only one tile wide and surrounded by mountains or ocean, but even that has the problem of the unit going to waste most of the time, and the fact that it gets consumed when I eventually expand past it.