And then there are the rivers.
In the East they mostly run eastward between the two armies, and they are no help to us, but a hindrance rather.

Here in the West the rivers, and they are many and great, mostly run southward, the way we want to go, and they bring our gunboats on their bosoms.

Excuse my poetry, but it's what I mean." "You must be right.

I think that all the reasons you give apply together.

But our command of the water has surely been a tremendous help.