I think that G.A. Hanson, author of "Minor incidents of the late war, as seen and chronicled by an eye-witness: actual occurrences, truly related just as they transpired," is Gustave Adolph Hanson, of Co. A, 17th (Sanders') Battalion, Tenn. Cav. This book is digitized online at Family Search if you want to read it. See link below, reference 59184, which begins at image 639.

https://familysearch.org/ark:/61903/3:1:3QSQ-G9SN-89HM-Z?i=656&cat=866392373