Hall, who later combined with Charles Nordhoff to write south sea talesamong them Mutiny on the Bountywas in England on the outbreak of WW I. He volunteered for the army and served on the front lines for some time, later joining the Lafayette Escadrille. So, plenty of combat experience.
This book is primarily his memoir of Tommy Atkins, with a little about French civilians and some anecdotes of Fritz on the other side of the lines. Although it follows Hall through enlistment and the recruiting sergeant's bad advice, through training and into two different sectors of the front, we learn only a modest amount concerning Hall himself, mostly by reading between the lines.
A good story, almost always upbeat, and highly complimentary regarding Tommy.