I just don't really find that honor and dishonor applies to battle.
Everything is fair in the game of war, the winner is the one standing at the end, not the honorous or dishonorous one.
In the end, if the dishonorous one wins, he's the one standing and alive, able to claim victory, so was it really worth it for the honorous guy just to keep that "honor"? He's dead, he doesn't care about honor anymore.