true, but bridge battles are awesome
Seconds - but one depleted unit breaking often triggers mass rout and the enemy rout to YOUR side of the bridge

So far I've only seen the "rolling hills" and "flat land" and "forest" battlefields. THere aren't really any "broken land" or jutting rocks which form a ridge or well - it all seems very mutes and smoothed off into a hill that is easily traversed aside from a few rocks or trees here and there.
I got 4 in a row last night (two sets of two battles on the same ground), allowing me to just defend one area with my flanks covered by a ridge - it was great and should happen more often, the only problem being the ridge wasn't in my deployment area so i had to run to it once the battle started

The only thing I hate about that redline is when skirmishers get trapped there, and when you hit the withdraw button they go to where they came from and not for the closest redline.
My general tried that through the entire enemy army!
I'm no programmer, just a player, but could this be the cause of the enemy routing to your side of the bridge on a bridge battle? Just a thought, it's probably wrong :)