I played with evolving algorithms playing some kind of robot war (in java) almost 20 years ago, and beside the fact that you had to be veeery patient since evolving a generation took 10 minutes at best, I realized that it's very hard to create a survival criteria that matches your intention.

I e, most robots fled and hid in the corners. I added additional critiera for hitting enemies, and the robots fled while randomly shooting bullets and hid in the corners...

No epic fights.

Hmm. Maybe I have the code somewhere...