Mr. Owens,
I took a look at the National Park Service's Civil War Soldiers and Sailors (CWSS) Database (
http://www.nps.gov/civilwar/search-soldiers.htm ) and searched for any James Brewster in a Virginia cavalry unit and came up with only one listing:
Brewster, James W.
Side:Confederate
Company:F
Soldier's Rank In:Corporal
Soldier's Rank Out:Corporal
Alternate name:James/Bruster
Film Number:M382 roll 6
Notes:Caldwell's Batt'n Va. Cav.
Plaque Number:
Not exactly sure where this Brewster/Bruster came from, but Co F, 16th VA Cavalry (originally part of Caldwell's Battalion, VA Cavalry) was formed mostly of men from Tazewell County per the website
http://www.nkclifton.com/amer-civ-war/Virginia/16th_Virginia_Cavalry/16thvacavcsa.html
Company F originally, was Taylor's Company, Caldwell's Battalion, organized 5 October 1862, Robert H. Taylor company commanding. The company was stationed at Camp Georgia from October 1863 to March 1864, was stationed near Luray. Notes in the records state, "The last muster roll, together with all papers and company records of the Co. were captured by the enemy at Moorfield, Va. on the 7th of Aug. 1864. This roll is made from memory and is as correct as could be under the circumstances." Signed:"Wm. Bailey, Lieut., commanding company near Luray, Va., Oct. 31 1864." Company F is comprised mostly of men from Tazewell County.
Note that the info above says the company records were captured by the enemy so the roll was made from memory. That could indicate that the James W. Brewster in the CWSS database might really be James S(quire) Brewster.