The Campaign - replayablity

[Bluevoss]

I was thinking about this last night. Its known that the rivers in that area were in constant flux, changing thier beds over the years. Why not alter the rivers (slightly) and move some of the deposits (a bit) - just a square here and there? Toss in or remove an occasinal swamp square. That way the maps stay mostly the same, but something that worked one time might not work so well in the following game.