Was playing a mission today and found a map that actual had a small pond with chest deep water. It was big enough that my whole lance could fit in it. I can just image that some of the custom hand build map could make good use of water or deep river running through he battle ground. Just like you can use mountains and high terrain to break up the battlefield water could be used also. This game is amazing and the mods that are coming out for it just makes it better and adds more spice to the game.