I'm playing and HRE game. I finished France and Poland, then moved into England and crushed them, and moved into the excommed North Italy, got them too. Now, in the mean time the Spanish, whom I am allied to, start building huge full-stack armies. Suddenly, they betray and invade me. My armies, which are streched thin, start losing tons of battles, and I am pushed back to Freisland and Ile De France. Then, the ENTIRE area of Spain except for Valencia plunges into civil war. I mounted a counter offensive, and now I am the supreme master of Leon, Aragon, Navarre, Valencia, Castille, and am moving into Cordoba.