Concerning desertion, Southern desertion anyway, it was real and the causes were many and varied. Of some 1800+ individuals that passed through the ranks of the 2nd Mississippi, I show some 297 cases of "desertion." However, while many cases were just that...desertion...upon closer examination of the individual Compiled Military Service Records you would find that many of these individuals were taken prisoner by Federal forces when sent home to Mississippi on furlough and word never got back to the regiment (northern Mississippi was under tenuous Federal control for much of the war); some were actually captured in battle but were never recorded as such on the company rolls, and other cases of misreporting, etc. I don't know if there have been any real statistical studies that scanned service records for just the term "deserter" in the records and reported the raw percentages out or if they looked in more detail at each individual record before arriving at a judgement. If the former, the percentages are almost certainly incorrect; if the latter, the numbers would be much closer to reality.