BURLINGTON, Vt. – A disallowed goal midway through the second half for the Dartmouth women’s lacrosse team proved to be the difference in a 12-10 defeat at Vermont’s Virtue Field Wednesday afternoon.

Jaclyn Leto’s free-position shot with 14:36 remaining in regulation beat Catamount goalkeeper Mackenzie Maher to give the Big Green a one-goal lead, 11-10. However, referees ruled after the play that the stick’s pocket was not legal, taking the goal off the board.

Vermont (9-2) seized momentum after that and went on to score the final two tallies of the contest to earn the victory.

For Dartmouth (4-4), the offense ran through the trio of Leto, Liz Calby and Danielle Lisovicz. Calby and Leto each had four goals in the game, while Liscoviz managed just one marker, but had five assists for a six-point effort.

The five assists were not only the first five of her career, but also are the most in a single-game in the last three years by any Dartmouth player. No one else on the current roster boasts a five-assist game as the mark is just two shy of the program record.

Leto tied her career high in goals — a figure she had reached twice before, including Saturday’s win against Columbia — while Calby was one off of her career-best mark. Calby, one of three senior captains on the team, now has 83 career goals and 120 points, sitting just outside the top-20 for scoring in program history.

The Big Green led by three at halftime, holding one of the nation’s best offenses to just five goals in the opening 30 minutes of play. An exchange of tallies early in the second frame ensued before the home team netted the final five of the afternoon to pick up the win.

Vermont’s Sydney Mas came into the game as the second-leading goal scorer in the nation this season with 40. She added another four to her 2014 total, including the game winner with 9:36 remaining in the second half that followed the disallowed Leto marker.

Mas also became the first player in Vermont women’s lacrosse history to go over 200 career goals thanks to her performance Wednesday.

Despite being held off the scoresheet for the first time all year, junior Sarah Byrne picked up a game-high five draw controls.

Making her 60th appearance and 59th career start in goal for the Green and White, senior Kristen Giovanniello turned aside eight shots and added two ground balls. Maher had 10 saves, including six in the second half.

Wednesday’s win marked the first time in the 27-game all-time series (Dartmouth, 21-5-1) that Vermont managed to earn victories in consecutive seasons against its rival from the Upper Valley. The Catamounts edged the Big Green last season on the road, 16-15, in a double-overtime thriller at Scully-Fahey Field.

Dartmouth returns to action Saturday when it travels to Brown for an Ivy League matinee. The opening draw between the Big Green and Bears is set for noon in Providence.