I'm not sure that's possible. The only thing I could think of that may do it is if you take your turns, and then switch the settings to hard before the end of the year. My guess is that will calculate the CPU's moves on hard though.
Bridge battles are ALWAYS easy. I've NEVER lost a bridge battle before and have been in some pretty tight spots with troops. I agree it's regrettable the CPU doesn't use the other bridge. They just send everyone across one and allow a flank, but that's how it goes.
If you want a good challenge when fighting play more offense. Even if they are invading your province, march out to meet them in the center of the field. Sitting on a hill somewhere and letting your missles kill 1-200 troops before you even start fighting is easy. I like to meet my advesaries chivilrously (stupidly) and march straight at them, send everyone in and let them hack it out.
Definately NOT the best way to win, but if you're looking for more excitment in defensive battles, it certainly fits the bill.
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