No clue why; different civs that have yet to lose a city- EVER- are popping the partisan event each turn, popping out a crap ton of units for no apparent reason. What's worse is that I don't get to share in the fun! If you load the save, you'll see that I can use the help. It's not just this save, either. Recently, it's been every time I progressed into the industrial age. To reproduce it, you just need to go to the next turn. It's just about every civilization in the game.