I think that two generals should be extremely difficult to beat in EU2, Fredrick the Great and Napoleon. Napoleon should be extremely hard to defeat, unless by another great general until he loses abilities in 1812. Fredrick the Great should be just as good if not better than Napoleon ((I believe Fredrick is the greatest general of history)). Though to kind of equal out there powers, if Napoleon and Fredrick start winning wars, coalition of countries should declare war on them all the time, because in actual history kings feared Prussia Rise and Napoleonic France and wanted to bring them down.