Following the Guidon is a biography of General Custer, written by his wife Elizabeth Bacon. The book deals with the late period of his military career. Bacon pictures Custer's ability to recall to duty after being court-martialed. Then, she brings a detailed account of the battles Custer was taking part in starting with the Battle of the Washita.

Elizabeth Clift Custer (1842 – 1933) was an American author and public speaker, and the wife of Brevet Major General George Armstrong Custer, United States Army. She spent most of their marriage in relatively close proximity to him despite his numerous military campaigns in the American Civil War and subsequent postings on the Great Plains. Left nearly destitute in the aftermath of her husband's death, she became an outspoken advocate for his legacy through her popular books and lectures