In an article titled "Guerrillas, Jayhawkers and Bushwhackers in Northern Arkansas During the Civil War" by Leo Huff (This article also appeared in AHQ)is the following:

The discouragement of the relatives at home and their attitude toward guerrillas was reflected in their letters to soldiers. Two samples from a Confederate mail bag captured at Indian Bay in Monroe County, Arkansas, in early March 1864 are quoted below.
…
A father expressed his opinion:

I tell you, my son, this country has gone up, and the sooner things get righted up the better for all of us. The citizens who have taken the have not suffered near as much as those who have not. In my opinion Gen. McRae has done ten times more harm than good, and only makes the Fed s worse; both sides emulate each other in robbing, killing, and destroying. Whatever you do, my son, do not come home: your safest place is in the regular army. The reports you hear about Southern soldiers being about here are false. McRae's men are no better than gangs of robbers. The Feds are showing them no mercy.

Does anybody know the source of or have a citation for this letter?