In November 1868, following the Battle of Washita River, Custer was alleged (by Captain Frederick Benteen, chief of scouts Ben Clark, and Cheyenne oral tradition) to have unofficially married Mo-nah-se-tah, daughter of the Cheyenne chief Little Rock in the winter or early spring of 1868–1869 (Little Rock was killed in the one-day action at Washita on November 27). Mo-nah-se-tah gave birth to a child in January 1869, two months after the Washita battle. Cheyenne oral history tells that she also bore a second child, fathered by Custer in late 1869. Some historians, however, believe that Custer had become sterile after contracting gonorrhea while at West Point and that the father was, in actuality, his brother Thomas. Clarke's description in his memoirs included the statement, "Custer picked out a fine looking one and had her in his tent every night."