The MPD is only police department that has arrested a sitting U.S. president. During his presidency, Ulysses S. Grant was known to speed in his horse and buggy on Washington's streets. The MPD had issued him three different citations for this offense. On the fourth occasion, President Grant was arrested on M Street for racing, and his horse and buggy were confiscated. When brought to the station however, the officers became unsure if a sitting president could be formally charged if he had not been impeached. Grant was allowed to pay a fine but had to walk back to the White House. In 1878, Congress abolished the Metropolitan Police Board and its duties were taken over by the newly formed DC Board of Commissioners, established by Congress to govern the entire District. That year as well, Thomas P. Morgan was named to replace Richards, who had resigned, as Major and Superintendent. Although a police fund had been established during the MPD's first year to assist those officers injured in the line of duty, Morgan would add to this by establishing a retirement fund for older officers who could no longer perform their duties.