gozerius wrote:Are you saying that unless a rule specifically prohibits a situation which violates the general principles of the game its allowed?
No. I'm saying there are no 'general principles'. There are just rules. You seem to be assuming that if, say, 5 sections of the rules have mechanisms that happen to prevent a BG breaking up and a sixth section does not prevent same then we should assume that there is a 'general principle' that says you can't break up a BG in the sixth section. But there isn't. I think you may be reading in things that aren't there.
The feeding in rules tell you very specifically how to feed in. Of course, the BG is still subect to the other rules, such as the BG Formation rules. And those latter rules say that you stay in a rectangular contiguous formation in many circumstances. So if you are in formation and just in combat to your front, you must stay in a the edge to edge, corner to corner formation. But it has exceptions, and fighting in two directions is one of them.
The thing is that the feeding in rule allows you to match against enemy bases, and if a BG is 'unformed' it is one of the exceptions to the 'rectangular formation'. It's also historically realistic. Crusader knights fighting Syrian, Ayyubid or Turk cavalry were keen to get stuck in. At Hattin, they were completely surrounded, thirsty and tired and yet they still all went into combat. I can't see it as remotely historical that half the knights wouldn't fight.