For years I have calculated the odds, rolled a dice, looked at a Combat Results Table, cross referenced it then determined the result of the battle. It is longer than you think if you have over 20 pieces to do this with and that is a conservative estimate.
I present my very own invention ... (drum roll)
A larger picture of the CRT Dice for the OGRE/GEV board game are here if you sign up with boardgamegeek . I have made four such dice to so far. As it stands I tried stuffing a 1d12 Combat Results Table onto a