Ardy,
Just don't fight Knights.....I don't understand why you would want to fight them anyway if you say you couldn't find any on the knight front, maybe they have a green horde but normally that isn't fun for long. I normally ask on 200 before I would switch, "How's the fight on the rook/bish front" and normally a muppet or 80th member will give you a honest answer.
Oh,
because sometimes late at night, when I get a chance to play, I'll see a horde of green (knits) vulching another base... and thats it for fights. So, either I join the vulch, which gets boring fast, or I switch sides and fight the vulch. The bottom line is that player volume becomes too thin so everyone gravitates to one fight, most people follow their squaddies, which results in wild imbalances when there are only 30-40 people playing the game. Next time I see it, I'll take a snap shot of the map and post it.