[quote=@Buddha]
[@Sarmatian] It was Danzig that was contested, but in fact it was most of the land around that that was also contested. The land given to them by the Polish king was never meant to remain theirs, but once they amassed larger power, they refused to give it back. Danzig was among that land, I believe. 


[/quote]

Right, it's been a while since I've done my reading.  I read William Urban's [i]Teutonic Knights[/i] book, and aside from some video games and online research, that's where most of my knowledge comes from.

They were actually doing something similar in Hungary, I think.  The King at the time had them defending against the Cumans, but the King's son believed they were "building a kingdom within a kingdom" or something, and so when the King died and the son became the next monarch, the Teutonic Knights decided it was time to up and leave.  I think that's when Hermann von Salza had them sent to Prussia, as he saw it as a great training ground before sending his knights to Outremer.