The New Home of the 5th Texas Partisan Rangers website is http://history-sites.com/5txpart/ . Your ancestor is listed in the NARA Records as:

James Wetsel - Private - Company "K" - Martin's Reg't Texas Cavalry (Microfilm Number M227 roll 39)

There are also two other Texas Confederate references to a James Wetsel:

Wetsel, James TX Inf. 3rd St.Troops Co.C
Wetsel, James TX Inf. Rutherford's Co.

Hope this helps.

Jim Martin

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