IMHO the two keys to the game are #1 massive naval superiority and #2 small borders. My decesion to attack a province usually depends on whether I can move my whole front forward to minimize the number of border provinces I have. In my current French campaign, my European border goes North to South: Friesland, Franconia, Swabia, Burgundy, Provence. Since I have Naval superiority I don't have to defend anything West of there, including the entire Iberian Penninsula. This saves drastically on upkeep costs. Because the pope is in Genoa with about five stacks, and I don't want to make him an enemy, I can't really expand any further into Europe without recruiting several more defensive armies. Instead I went across N. Africa and I'm currently crusading in the Holy land.
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