The Cobblers hosted home games at Millbrook Park and were immediately succeeded by the 1916 Portsmouth Truckers who won the Ohio State League championship.
[4] Portsmouth joined the Lancaster Lanks, Lima Cigarmakers, Mansfield Pioneers, Marion Diggers and Newark Newks in Ohio State League play, which began scheduled games on April 23, 1908.
[4] In their second season of play, the 1909 Portsmouth Cobblers placed fourth in the six–team Ohio State League standings.
Portsmouth's Frank O'Day won the Ohio State League batting championship, hitting .324.
Irwin was killed as a result of being thrown through a saloon window in Philadelphia, as a shard of glass penetrated his jugular vein.
The Marion batter hit Childs' first pitch to the fence in center field, where it was caught by Frank O'Day, with the three base runners all running on the play.
[18][19] Portsmouth finished 6.0 games behind the first place Springfield Reapers in the final standings, as the Ohio State League expanded to eight teams.
[4] At age 19, Baseball Hall of Fame member Billy Southworth began his professional career with the 1912 Cobblers.
[4] Billy Southworth began the 1913 season with Portsmouth, hitting .310 in 77 games before being promoted to the Toledo Mud Hens.
[4] In their final season of play, the 1915 Portsmouth Cobblers defended their championship under a new manager and won their fourth league title.
In the playoffs the Cobblers defeated the Maysville Angels, winners of the second–half title, 4 games to 1 to win the championship.
The Portsmouth Truckers won the 1916 Ohio State League championship under returning manager Chet Spencer.