An informal agreement was reached between the NHA and PCHA in 1915 that called for the two league's respective champions to meet each year to determine the Stanley Cup winner.
The arrangement stated that the series would be played alternately in the east and west, and that the different rules of the two leagues would alternate game by game. (The PCHA still employed the rover, though it had introduced more modern passing rules.)
Deadlocked with 14-6-0 records at the conclusion of the NHA season, the Ottawa Senators and Montreal Wanderers played a two-game total goals series for the league title and the right to face the PCHA champions. The Senators outscored the Canadiens 4-1 and packed up for the first Stanley Cup series to be played west of Winnipeg.
Fred "Cyclone" Taylor notched six goals in three games, and Barney Stanley scored four in the third, to lead the Millionaires to a one-sided sweep of the best-of-five series.
1914-15 - Vancouver Millionaires - Ken Mallen, Frank Nighbor, Fred (Cyclone) Taylor, Hugh Lehman, Lloyd Cook, Mickey MacKay, Barney Stanley, Jim Seaborn, Si Griffis (captain), Johnny Matz, Frank Patrick (playing manager).
SCORES
| Mar. 22 | Ott. Senators | 2 | at Vancouver | 6 |
| Mar. 24 | Ott. Senators | 3 | at Vancouver | 8 |
| Mar. 26 | Ott. Senators | 3 | at Vancouver | 12 |