I received the following e-mail that has invaluable info: (Moseley is mentioned on 7 pages)
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My great great grandfather served in this unit. His name was John Raney Bertrand. He served in 7th Texas Field Battery (Moseley's Co., Light Artillery) Confederate Army--Sergeant. He was born 21 May 1830 in Brazoria Co., TX. Died 23 Nov 1907 near Purmela, Coryell Co., TX. He married Mary Frances Slade Cayce 12-16-1869 at Honey Dell Plantation, Wharton Co., TX.

I have that he served four years, but no other specific information.
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From my 200-page Name Index: (I only address 24 counties of North Texas, and Moseley is not from North Texas)
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MOSELEY, Wm. Griffin Moseley, b-1825 NC; m-Emily; ? Carrington; 1860 Brazoria cen p63 (Capt, 7th Field Light Battery, CSA) ... on 7 pages of my book.
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Patti, prochette@Juno.com
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