The injury sustained by Geo. W. Bradley, of the Cincinnati Unions, in his collision with Dunlap during Thursday's game at the Union Grounds, proved to be more serious than at first reported. An examination made yesterday morning developed the fact that one of the small bones of his right forearm was broken, and he will be forced to retire from the field for at least a month, if not for the rest of the season. He left for Cincinnati last night. No more earnest or painstaking player ever appeared on the diamond, and the accident will cause general regret among patrons of the game in all parts of the country.-St. Louis Globe-Democrat, August 9, 1884
I'm much too lazy to go look up game accounts but it's possible that this was the end of Bradley's pitching career. While he continued his baseball career, playing in various leagues for several more years (including a short stint with Philadelphia in the AA), Bradley never pitched in the major leagues after 1884. So maybe we should add to the list of Dunlap's accomplishments that he ended George Bradley's pitching career.