Great stuff! And consistent with what the early authors such as Jordan & Pryor (1868) and Wyeth (1899) said: primarily short Enfields plus a belt pistol (Colt Navy preferred) or two.
Note also that Forrest had a reputation for arming many of his men from battlefield captures. Just a few months before, the 7th Tenn. Cav., McDonald's Battalion and Faulkner's Regiment (7th Kentucky Cav.) bluffed the Union City, TN garrison (primarily 7th Tenn. Cav. (U.S.)) into surrendering, thereby capturing "475 men, with their arms and ammunition, camp and garrison equipage and 300 horses" on March 24th. (Jordan & Pryor, p. 409; O.R. vol. 32, part I, pp. 609, 611 (Forrest reports)) Since the captured force was almost entirely cavalry, at this point in the war they likely had been armed with breech-loading single-shot carbines, though the after-action reports do not state. See, e.g., O.R. vol. 32, part I at pp. 542-46. A few weeks later Forrest captured "about 350 stand of small-arms" at Fort Pillow. O.R. vol. 32, part I, p. 616. (Forrest's report). Fort Pillow had been garrisoned by a mixed force of four companies (about 220 men) of heavy artillery, one section of light artillery (about 40 men) and about 250 recruits and 45 enlisted men and and officers of the 13th Tenn. Cav. (U.S.), so the arms captured there were likely a mix of infantry and cavalry arms along with the six cannon captured. O.R. vol. 32, part I, pp. 554-56.