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I was playing with dwarves in the center, and we merged our troops. I brought in new units in a chain and started taking a castle, and then they did this. (What kind of developer came up with making them a separate unit? Thanks to this game-breaking and time-wasting mechanic.)
I'll upload replays and screenshots soon.
ps. Moments like these completely kill the desire to play (I haven't cursed this much in a long time).
Added 50 minutes later
What the heck, their quantity depends on the month... well, I guess it depends on the level of the town, but what does the month have to do with it? :((
