Can also look into the Southern Historical Society's publications post Civil War, as it was Confederate based publication and how they speak is transmitted to paper.
Under Both Flags - written for and by Civil War Veterans (1896) - I have originals and don't know if I would trust the re-print. There will be photographs in there, a lot of naval pictures and stories in addition to Infantry. And, you won't find it hateful to either side. There are women who tell their story also.
Being mindful that there are many 'class' levels so speaking in one's class -- High Society/High education, middle-class, lower class--
M. E. Wolf