The simple answer is, if you do something dumb, you get disastrous results[SUP]1)[/SUP].
Here are the facts as I understand them:
- McDowell was in the middle of a retreat across the Potomac, from Fairfax to King George.. Queensland.. ... what ever the region is with Washington DC is.
- McDowell's stack had <5 MC in Fairfax.
- The Union player, in plotting the move for the turn after the battle, put McDowell's stack in to DP; remember, it is still in Fairfax, with <5 MC, which at the start of the turn automatically changes your stack to OP, which causes the stack to attack.
- When a stack is in a battle, which starts while it is crossing a river, the stack receives the invasion penalty during that battle, which can make for some very high casualties.
There is nothing surprising about this, other than that the player put McDowell into DP while McDowell was in a region, where he had <5 MC.
[SUP]1)[/SUP] Making mistakes is how you learn. It's painful, but effective. Now you have learned.