author
Remembered chiefly through a rare late-19th-century regimental history, this little-known writer is connected with a firsthand account of California militia life during the Sacramento campaign of 1894.

by California. Infantry. First Regiment. Company B, Irving B. Cook, George Filmer, W. J. Hayes, A. McCulloch, William D. O'Brien
Very little biographical information about A. McCulloch could be confirmed from reliable online sources available during this search. The name appears most clearly in connection with The "City Guard", a historical volume published in 1895 about Company B, First Regiment Infantry, National Guard of California, covering the Sacramento campaign of July 3 to 26, 1894.
Project Gutenberg lists A. McCulloch among the credited contributors to that work, alongside George Filmer, W. J. Hayes, William D. O'Brien, and Irving B. Cook. Based on that evidence, A. McCulloch seems best understood as one of several collaborators who helped preserve a detailed military and local historical record rather than as a widely documented standalone literary figure.
Because dependable personal details such as full name, dates, background, and other publications could not be verified, it is safest to treat A. McCulloch as an obscure historical contributor whose surviving reputation rests on this single documented book.