Change your message settings to pause upon conclusion of a land battle. You'll thank me.
Lower speed also works somewhat to the same effect. Speed 3 is good for me, if I'm fighting one war at a time.
Things I wished I had realized before doing silly mistake in my Muscovy game... Russian winter is cold and attrition is high, even Moscow Russians will feel cold when they are besieging Novgorod's castles in the winter campaign...
Perhaps I should try to strategize sieges and campaigns better? Use siege leaders when you can, minimize attrition, use artillery. If the cold winter approaches, consider assaulting the castle instead of starving the castle out in high attrition winter.