Ok here whats happen. While playing as Poland you are getting this unhistorical event "nieszawa privelige" (in game implementation of that event is pure failure) , even fired in 1473 ... choice accept and get +5 tech -20 stability or get 42k rebel stack ? WTF max manpower is 22k and i am getting stack doubling my manpower... briliant idea from paradox (not mentioning that they rebels have 3.8 morale compared to my 3.5).