It starts in a good position to form either Prussia or Germany. Brandenburg starts fairly weak in close proximity to some bigger nations such as Bohemia, Poland and Denmark. The following requirements are set out in the decision: Before being able the form Prussia, you'll of course have to choose between Protestant and Reformed. Early reich– just forming Germany gives you the achievement. After that the 2 provinces from pomerania you take the mission, then fab claim on the other. There’s another mechanic called militarization of country, it rewards you for playing tall, as having more provinces will decrease the militarization. But once you get all national ideas done along with couple of military ideas, your armies are basically unbeatable and you will have very high army tradition which means godlike generals too, making wars very easy.