They were all horrible at conventional warfare because they were fighting with outdated ideas and modern technology.
Picketts Charge was a futile waste of men.
From the reviews it doesn't look like Fellman researched his book very well. Since Sherman considered Salt contraband and understood its value I doubt he would have wasted it on fields. Especially since he would have had to haul all that salt down from the north since the south was severely low on salt.
