Further, Weiland was matched with Dit Clapper and Dutch Gainor on a powerful forward line which garnered the nickname "Dynamite Line," one of the first named forward lines in history. The Bruins rebounded with a 13 game unbeaten streak, which gave them a 16–7–4 record and suddenly in contention with the New York Rangers for top spot in the American Division. Boston had a 10–6–1 record in their remaining 17 games, and held off the Rangers to defend their American Division and the Prince of Wales Trophy, finishing with a 26–13–5 mark and a team record 57 points.
Harry Oliver led Boston in scoring, with 17 goals and 23 points. Dutch Gainor and defenseman Eddie Shore finished just behind Oliver with 19 points, while rookie Cooney Weiland tallied 11 goals and 18 points. Shore led the club with 96 penalty minutes, while team captain Lionel Hitchman finished with 64 penalty minutes.
In goal, Tiny Thompson had an impressive rookie season, winning 26 games while posting a 1.15 goals against average—both Bruins' records, as well as recording 12 shutouts. Thompson's 1.15 GAA remains the Bruins' single-season record and is the second lowest ever recorded over a full season in NHL history.
In the playoffs, Boston had a first round bye, due to finishing on top of the American Division, and faced the Montreal Canadiens, the winners of the Canadian Division, in the semi-finals in a best-of-five series. The series began with two games at the Boston Garden, and the Bruins, led by Tiny Thompson, won both games by identical 1–0 scores to take a 2–0 series lead. Game Three shifted to Montreal, and while the Canadiens were able to solve Thompson for two goals, Boston scored three of their own, and swept the series.
In the Stanley Cup Final, Boston faced their divisional rival - and the team that eliminated them from the playoffs the previous season - the New York Rangers in a best-of-three series. New York had defeated the Detroit Cougars and the Toronto Maple Leafs to earn a spot in the Final. Game One was played in Boston, and Thompson again shut the door, as the Bruins won the game 2–0. Boston completed the two game sweep at Madison Square Garden in New York City, defeating the Rangers 2–1, to clinch the first Stanley Cup in team history and making them the third American team to win the Cup championship.