For many years, Stratford was a premier franchise in the Intercounty Baseball League and one of the league's founding members in 1919 (along with Galt, Guelph, and Kitchener).
Prior to its re-location, the team changed its name from the Storm to the Nationals for the 2006 season, in view of the Canadian National Railway's historical importance to Stratford.
The Nationals struggled in their final seasons, missing the playoffs regularly.
On November 25, 2008, the team announced that the league had approved the sale of the Stratford Nationals to Elliott Kerr, president of the Landmark Sports Group, and the transfer of the franchise to the City of Mississauga, where it became the Mississauga Twins.
Intercounty League The Stratford Nationals also won the Ontario Baseball Association title in 1930, 1931, 1932, 1933 and 1934.