Frederick Sadleir Brereton (b. 1872, d. 1957) was a prolific British author of adventure fiction, primarily for young readers. He served as a surgeon in the British Army, a background that lent authenticity to his military-themed novels. His service life gave him firsthand experience and a vast reservoir of historical knowledge that he utilized to craft vivid narratives set against rich historical backgrounds. Brereton's literary style often featured young protagonists displaying courage, honor, and patriotism, mirroring the virtues of the times and influencing the moral education of his young audience. Among his numerous works, 'Under Foch's Command: A Tale of the Americans in France' stands out. It follows the endeavors of American soldiers in World War I under the leadership of Marshal Ferdinand Foch. The book is highly regarded for its historical accuracy, thrilling action, and the evocative rendering of the battlefield's harsh realities, qualities that are emblematic of Brereton's writing. It serves not only as a work of entertainment but also as an educational tool that provides insight into the pivotal moments of World War I. Brereton's books, which often ran in series, were popular during the early 20th century and continue to be remembered for their contributions to youth literature and their role in shaping the adventure genre.