I thought the very same thing, Clausewitz...once it was too late. My flanks were 'in the air' and I did my best to anchor them, but there really wasn't any terrain available to help me do that, so I used the knights, one on each flank. I was a little too concerned about that I think, which is why I kept them in close. In the end my right flank got completely mangled, and my left was shaky. Only my middle held tough, which is where the strength of my army was anyway.
If not for turn 5, it would have been a nice defeat for me. My guys must've sensed it!