The prolific writing of Nebraska author Mari Sandoz evolved through her rigorous routine of producing multiple drafts and scrutinizing the work of editors and publishers. She faced multiple challenges throughout her career, made more difficult by her health and cancer diagnoses. While Sandoz fought this illness during the last two years of her life, she also worked tirelessly to complete her last projects. This included The Battle of the Little Bighorn, published posthumously in 1966. Sandoz’s niece traveled to New York City to assist her with draft revisions of the manuscript and later reflected on her aunt Mari’s endurance through painful treatments. This essay offers insight into the battles Sandoz endured during her final months of writing the history of the Great Plains.