author
A firsthand chronicler of the Spanish-American War in Puerto Rico, he wrote with the immediacy of someone who had marched with the troops himself. His best-known book blends battlefield reporting, travel writing, and personal observation into a vivid account of the 1898 campaign.

by Karl Stephen Herrman
Best known for From Yauco to Las Marias (published in 1900, with a later edition in 1907 under the fuller title A Recent Campaign in Puerto Rico by the Independent Regular Brigade under the Command of Brig. General Schwan), Karl Stephen Herrmann wrote a detailed account of the U.S. campaign in Puerto Rico during the Spanish-American War.
The Library of Congress record identifies him as the author, and the text itself presents the work as a direct, on-the-ground narrative of the brigade's march, camps, and engagements. That gives his writing much of its appeal today: it reads not as distant history, but as a personal view of soldiers, officers, and daily military life during a short but consequential war.
Little biographical information about Herrmann was readily confirmed from reliable sources consulted here, so the strongest picture that emerges is through his book itself: a writer interested in military detail, atmosphere, and the lived experience of the campaign in Puerto Rico.