I choose, int he campaign, to start out with the "Holy Roman Empire" faction for two reasons:
1-There flag looks cool
2-They were ina startegic place, the middl eof EUopre...Spain was to south, England was too North, Denmark was too north, Italy was too suth...Germany (HRE) was in the middle
So far, I lost in a batlle with some German rebellions, I won them later on, and I just made Poland my enemy by attacking it and I lost at the end , I was supposed to only destroy Denmarka nd Milan to win but I got frustarted so I attakced them