Coloring Rivers in on the Marengo map.
The double streams with the swamp only cost 1/3 a move to cross!
Here you can see the road I drew in with a #2 pencil, which connects the road from the fort with the bridge across the river. This allows a unit to use the March Column move rate from Alexandrie North and cross back over the rive on the French right flank. This is the intent of the designer.