It would be interesting to know more about the logistics of running a mobile army in that era. I'd guess it would be hard work even to get hold of adequate maps

It would be interesting to know more about the logistics of running a mobile army in that era. I'd guess it would be hard work even to get hold of adequate maps for the regions you might decide to move into. Even with maps, you'd still face problems of trying to predict where food would be available as you moved forward.