After retiring from LSU in 1978, Haag continued to pursue his interests, writing and professional affiliations, expanding his sphere of activities to include community activism and study of the Civil War. Of his retirement, Haag said, “…to tell you the truth, I’ve never been so busy in my life.”
WALKER: What sort of interest is it that you have in the Civil War?
HAAG: Well, it is that, when I retired, such relaxing reading as I want to do, or can do, has been involved in the Civil War. I had an interest before, but it was superficial. But now I’m really involved in it.
Also, I was very early thrown in constant contact with T. Harry Williams, the man to whom this oral history is dedicated. After all, he is still one of the great names in American Civil War history, and of course I’ve read everything he ever wrote, and enjoyed them, sometimes twice. I suspect that’s about all the serious reading I’ll do.