These are some ideas and practices that have come up in a current game. Do they hold true, or is there a better way?
When the foe marches deep into the South, swarm the countryside with partisans. The Federals will find it necessary to protect rail supply lines by stationing units in each area the line runs through. Attack these detachments with fast moving, small cavalry divisions.
Raid the North with Quantrill and his raiders; use the RGD plunder cards. This can earn up to $210 dollars a year with little effort or risk. It is not necessary to control the city or area when playing the card.
Use the Disinformation and Cavalry Screening RGDs to disappear. This might allow you to extract your force from a dangerous encirclement.
If your nation and its rail system is cut in two, it is impossible to use the strategic transfer to quickly move leaders and support units from one theater to another. Prepare for this by ensuring the necessary commanders and supply wagons are in place before your rail network is cut.