ORIGINAL: Curtis Lemay
Pure rubbish! Burnside lost so many bridging engineers bridging the Rapahannock that he was told that he practically had a bridge made of bridging engineer bodies. Had the Rapahannock been a wadi there would have been no such issue. The fact that heights beyond the Rapahannock also provided a powerful defense was independent of the location of the Rapahannock.
Why don't you dig up the figures for us, Curt? How many men were lost in the actual crossing and how many in storming the heights?
As to Lee's deployment, that is how one is
supposed to defend a river -- or for that matter, a wadi, or a wadi with a little water at the bottom, or a modest river in a canyon with steep sides, or any one of the possible combinations of
what are all variations on the same theme.
If there
aren't heights of some kind, then either (a) the river is not militarily significant in the first place, or (b) it's pretty damned big. But generally, rivers flow at the bottom of something (go figure), and that means there's higher ground along either bank, and
that's where one defends.
There are exceptions, of course, but that's the general rule. Read any discussion you like of the issue. It's practically a platitude. Generally, one doesn't defend a river from the bank -- and one
certainly doesn't defend a wadi from the bottom.
In other words, the presence of water doesn't really affect how the defender approaches the situation except in the sense that if there isn't a substantial flow of water, the obstacle may no longer be militarily significant -- in which case it shouldn't be on the map at all. However, if it remains militarily significant, it will defended exactly as if it was a river -- from the heights opposite the crossing.