There's not much known about this command, which organized in some fashion during the final months of the war. Art Bergeron writes, "Most of its service consisted of courier and guard duty around Shreveport and Alexandria." The book to review for this is titled Guide to Louisiana Confederate Military Units, 1861-1865.
Company "I" was the "Calcasieu Rangers" from Rapides Parish, Capt. William E. Ivey. You can order copies of Albert Willis Pope's service file with the 6th Louisiana Cavalry by using the message board link at the top of the page.