This would be their last game in the TBJHL. In 1930, the Thistles were accepted into the South Division of the Manitoba Junior Hockey League which would cut back on their travel as all the teams in the South Division were from Winnipeg, Manitoba. After winning the division in just their third season, the Thistles were forcefully moved to the more distant North Division. Despite the travel, the Thistles took their first league title in 1934. The Thistles would end up losing the Abbott Cup semi-final to the Port Arthur West Ends 9-goals-to-8 in two games. From 1936 until 1939 the Thistles suffered, three consecutive losing seasons left them financially in trouble. The 1939-40 season was a great season for the Thistles. They won the league by defeating the Elmwood Maple Leafs 3-games-to-none in the league final, then won the Abbott Cup as Western Canadian champions. In the Abbott Cup semi-final, the Thistles defeated the Port Arthur Juniors 2-games-to-1. In the final, they defeated the Edmonton Athletic Club Roamers with 2 wins, 1 loss, and 2 ties. In their first and only Memorial Cup appearance, the Thistles and Oshawa Generals marked the second time two teams from Ontario would square off for the Memorial Cup. The Generals won game one 1-0, and game two 4-1. The Thistles rebounded and won game three 4-3, but lost game four 4-2 and the series 3-games-to-1 to the Generals. In the summer of 1940, it became apparent that they would not have the numbers or the money to continue competing during World War II and folded. "Note: GP = Games Played, W = Wins, L = Losses, T = Ties, OTL = Overtime Losses, GF = Goals for, GA = Goals against"