author
A California National Guard company is credited with this vivid regimental history, centered on the 1894 Sacramento campaign and the long life of San Francisco’s City Guard. The book has the feel of a firsthand memorial, mixing military record, local history, and the voices of men who served together.

by California. Infantry. First Regiment. Company B, Irving B. Cook, George Filmer, W. J. Hayes, A. McCulloch, William D. O'Brien
This is not an individual author but a military unit: Company B of the First Regiment, California Infantry, identified in later editions as the "City Guard." The group is credited as creator of The "City Guard": A History of Company "B" First Regiment Infantry, N. G. C., first published in 1895.
The work focuses on the company’s service during the Sacramento campaign of July 3 to 26, 1894, during the unrest connected with the Pullman strike. It also includes a longer retrospective history of the company from its organization on March 31, 1854, giving the book value both as a military narrative and as a record of civic life in San Francisco.
Project Gutenberg and library listings also name Irving B. Cook, George Filmer, W. J. Hayes, A. McCulloch, and William D. O'Brien as authors associated with the volume. Because the credited creator is the company itself rather than a single person, there is no clear single-author portrait to use here.