Was having a blast in the full campaign, when the Emperor decided to send both my biggest armies (Tilly and Wallenstein - plus Marradas for good measure) to Poland. They all got magically transferred there and vanished through starvation on the long trip back (for some reasons another separated stack of depleted supplies that i detached from the armies got magically transferred to a blocked area east of Danzig). Hours of carefully crafted strategy wasted (I tried backing up the save few times on the turn of the Polish transfer but the results were always very similar so I decided to continue as see what happened. I thought ' Maybe they will magically go back somewhere where there is supply, it would be an insane game design choice to have the player lose three armies this way'. I was wrong.
Now, I don't mind when a game throws a curveball at you but there is no way that the Emperor would have made such a suicidal choice in reality (and historically he didn't either). I progressed the game almost a year anyway but now the armies are totally wiped out, unable to move in bad terrain and the Danish armies that were on the brink of disasters are ravaging the Imperial lands almost all the way to Wien. There is no point in continuing the campaign.
I would strongly suggest to revise the code for this event since as it is its totally game breaking, maybe limiting the transfer to one Army? Such a shame that a very enjoyable campaign got ruined by a scripted event...