Relationship information: Cotter enlisted into E Company of the 9th New Hampshire Infantry as Private. He was discharged due to disability resulting from an injury he sustained while serving this regiment. The precise date of his separation is unclear, however. The American Civil War Research Database indicates that Cotter was discharged in June 1865, while The Medical and Surgical History of the War of the Rebellion dates his discharge from service in October 1866.

Relationship information: Aged 45 years; admitted with typhoid fever; later transferred to a hospital in Philadelphia and returned to duty.