A Mississippi website tells us:
"Brig.-Gen. John B. Villepigue's command at Abbeville and Grenada, in June, 1862, included the Thirty-third and Thirty-ninth Mississippi Regiments, Fourteenth Artillery Battalion, First Mississippi Cavalry, company of partisan rangers, besides troops from other States. His staff was Capt. Kinloch Falconer, Adjutant-General; Capt. Thomas M. LeBaron, Quartermaster; Capt. Bolton Mickle, Paymaster, Dr. W. W. Hart, Principal Surgeon; Capt. George West, Commissary; Lieut. G. W. Simpson, Inspector-General; Lieut. H. T. Scott, Ordnance Officer; Lieut. G. O. Watts, Chief Engineer.
The Thirty-third and Thirty-ninth composed the brigade of General Villepigue in the attack upon Roscrans at Corinth, October 3-5, 1862."
My personal interest is with that company of partisans. If anyone has any knowledge of it or where I can find out about it, I would appreciate it. We know that following the Battle of Corinth, although Corinth was not taken by Van Dorn, Grant did not really have the men to do anything but hold it. While waiting for reinforcements, he commanded a very thin line, trying to protect the railroads. During this time, which Grant personally felt was the lowest part of the war (for the Federal cause, in any case), partisans frequently torn up tracks, even derailing a locomotive.