It is why when games get tense or something really matters it is often helpful to slow down and go through each sequence.
Exactly, that is why I want to discuss this now so I have a firm basis from which to state what the rules say.
The rules state that bases removed obey the following priorities for removal:
1. shooting - na
2.Close combat: Any front rank base facing the enemy BG which inflicted most hits on the BG. (For sake of argument, we are saying the bows inflicted the most)
5. If a BG is in close combat with 2 or more enemy BGs, do not remove a base that would leave any of the enemy BGs (except those fighting only as an overlap) without a base to face (unless you run out of bases). My note: Removing Base A clearly leaves Cav 2 without a base to face. Removing D leaves the Bows without a base to face.
The last paragraph gives a lot of what ifs: ".... If not, front rank bases that are not in close combat or are only in close combat as an overlap must be used. If there are no such bases available, and there is a gap in the front rank, front rank bases in close combat must be shifted sideways to fill the gap. The player owning the BG chooses which direction to shift, but if possible, it must leave at least one base in contact with each opposing enemy BG (except those fighting only as an overlap)."
So if the Bows inflict the most hits, then D is removed but since that leaves it with no base to face then we shift A, B, and C to the left and that leaves Cav 2 with no base to face. Granted it would still get to fight as an overlap but it is no longer committed to close combat and is free to move away. I don't quite see where this paragraph forces us to maintain contact with the Bows. When the knights lose a base then either the Bows or Cav 2 will not have an opponent to face. I'm not sure there is a choice in this case.
One outcome would be: If the bows inflict more, base D is removed, the knights conform to the Cav in their turn and the Bows charge them in the flank. Ouch. If I had a choice in this situation, I'd be tempted to remain in contact with the Bows and take my chances with the dice rather than a sure loss of a cohesion level. Cav 2 isn't in a position to attack other than as an overlap.
And a corollary question: If there was a small gap between Cav 1 and Cav 2 so that removing Base A would no longer allow Cav 2 to fight as an overlap, would your answer still be the same?