I have read information online saying that the 45th Alabama began in or near Auburn, which confused me upon learning that my own ancestor who was a member had mustered in at Loachapoka. I believe it implied some disagreements among some of the officers creating various units and that ultimately the group from Loachapoka joined up with another at Auburn to form the 45th. When you find information about later travels, it will tell you that the 45th went to the area of Corinth or Tupelo -- not certain of details just now -- where battles were known to have occurred. But at some point they clearly headed back into Alabama since you indicate that Campell died in August 1862, and I know that my own direct ancestor, William Jackson, died August 8, 1862, "near Montgomery" per a statement in his records. I too would love to learn more details! Good luck.