Harry Flashman finds himself entangled in the violent conflicts of the American West, desperately maneuvering to survive the Battle of the Little Bighorn. As a self-serving anti-hero, Flashman navigates the treacherous landscape of the 19th-century frontier, encountering historical figures like Custer and Sitting Bull while prioritizing his own preservation above all else. The narrative is presented as a discovered memoir, utilizing a first-person perspective that highlights the protagonist's cowardice and opportunistic nature. He faces constant threats from both military forces and indigenous warriors, relying on his cunning and luck to evade capture or death.

This work is widely regarded as a quintessential entry in the Flashman series, celebrated for its meticulous historical research and biting satirical tone. Readers often highlight the author's ability to blend genuine historical events with the protagonist's absurd and self-serving escapades. The narrative is frequently praised for its unflinching portrayal of the American West, avoiding romanticized tropes in favor of a gritty, cynical realism. The character of Flashman remains a polarizing yet compelling figure, serving as a vehicle for the author to critique the imperialist attitudes of the era. The book maintains a consistent reputation for being both informative regarding historical detail and highly entertaining in its execution.