To add just a bit to the sharpshooter discussion, here is a post that I made a few weeks ago on the Texas board coincidentally on the same subject:
Van Dorn seemed to be intent on forming sharpshooter battalions for the brigades of the Army of the West during this time period. Van Dorn issued special order #114 of June 15, 1862 as follows:
"As it is at present impracticable to organize a battalion of sharpshooters for each brigade as contemplated in Gen Order #34 from the War Dept.-each division commander will designate one regiment from each brigade to act as sharpshooters. They will be particularly instructed...and carry long range arms."
Special Order of Maury's Division dated 8/1/62:
"Par II Major Bridges battalion of sharpshooters will at once be consolidated with LtCol Stirman's battalion of Arkansas Cavalry [dismounted] and the whole to be under the command of LtCol Stirman as the regiment of sharpshooters for Phifer's brigade."
I seem to recall that Bridge's battalion was an extemporized unit of companies chosen from regiments of the brigade. That is probably how the 6th Texas cavalry man wound up in Stirman's unit via Bridge's battalion.
This regiment was broken up soon after the battle of Corinth and reverted to Stirman's Ark dismounted cavalry battalion. Much of Bridge's battalion were apparently re-absorbed by their original regiments such as the 6th Texas, as several of these dismounted Texas cavalry regiments were being remounted after the battle.
My post was in reply to a question regarding Col Stirman's sharpshooter regiment and how a man from the 6th Texas Cavalry wound up in this unit.