What is the author's style in Flashman in the Great Game: From the Flashman Papers 1856-1858 by George MacDonald Fraser?

Flashman in the Great Game is told in British English. The narrator is an octogenarian writing about his life and career early in the 20th century, about events that fall in 1856-58. There is much 19th-century jargon—particularly military—used. This book uses less dialect than many of the Flashman novels, although there are Scottish and Irish characters who spout a bit of brogue. Remarkably little of India's pidgin English is incorporated, but a plethora of technical terms (ranks, honorific, and specific objects) are included, generally being explained the first time encountered in footnotes.