LAVAL, Quebec — The Montreal Victoire are heading to their first Walter Cup final as they defeated the two-time defending champion Minnesota Frost 2-1 at Place Bell on Tuesday night in the fifth and deciding game of their Professional Women’s Hockey League semifinal.Marie-Philip Poulin scored the winning goal at 3:06 of the third period on the power play. The win sets up a best-of-five final against the Ottawa Charge, ensuring that the league will crown its first Canadian champion. It was Poulin’s second winning goal of the tight series.The game, which was originally scheduled for Monday night, was postponed because of player safety concerns related to an illness.It is the first time the Frost lost a game facing elimination, moving to 6-1. They have been in all of the league’s deciding fifth games.Erin Ambrose made a cross-ice pass to Poulin, who beat Maddie Rooney on a sharp angle near the goal line.Minnesota pushed hard after the goal, getting several chances in the Montreal end, but Ann-Renee Desbiens was solid in the Victoire net. Rooney made some big saves of her own, keeping the game at 2-1.Samantha Cogan scored for the Frost, while Rooney made 15 saves.Catherine Dubois also scored for the Victoire, while Desbiens made 25 saves, including eight in the third period.Montreal opened the scoring whe …