Dave Williams:
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Your Camplain/Kamplain/Champlain/Kemplain, etc. family members are not listed in my 134-page Name Index ... and I looked at all of the alternate spellings that came to mind.
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Two of the Captains, and their militias, of the 15th Texas Cavalry are listed in my book: Pickett and English.

Captains Frizzell and Cathey are mentioned in the text of THE BOURLAND PAPERS and the 15th Militia Brigade Correspondence, but I do not have listings of their militia members.
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Quoting Justin M. Sanders:

The 15th Texas Cavalry was organized in Dallas on 10 Mar 1862, was reorganized on 20 Mar 1862, and spent that spring training near Clarksville, TX. Counties where some of the companies were raised were: Co A (Capt. M.L. Harper) Dallas; Co B (Capt. G.B. Pickett) Wise; Co C (Capt. William K. Mastin) Kaufman and Collin; Co D (Capt. Frizzell) Collin; Co E (Capt. M.D. Kennedy) Tarrant; Co G (Capt. A. Faulkner) Denton; Co H (Capt. English) Hunt Co; Co K (Capt. W.H. Cathey) Johnson Co. By May 1862, the regiment was in Little Rock, AR where it was brigaded with the 12th, 14th, 16th, 17th, and 18th Texas Cavalry Regiments. The first fighting experience for the 15th came in a skirmish on 8 July 1862 near Batesville, AR on the Black River.

http://www.rootsweb.com/~txkaufma/civilwar/15txcav.htm

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Patti, prochette@Juno.com