After Cowan made the first two saves, Mounsey finally batted in the rebound and gave the Bears some life with just 56 seconds remaining in the first half, narrowing the score to 2-1.
Re-energized by its late goal, Brown came out from halftime looking for the equalizer.
Exactly three minutes into the second half, the Bears found what they were looking for as Mounsey netted her second goal of the game off a penalty corner and tied the contest 2-2.
Harvard protested that the goal was too high to no avail, and the Crimson knew it was in trouble.
With the momentum on their side, the Bears kept coming and appeared to score the go-ahead goal midway through the second half on another high shot by Mounsey.
However, the Crimson caught a break as Mounsey's goal was disallowed for being dangerously high.
Cowan and the Harvard defense weathered the storm for the remainder of the second half and sent the game into overtime.
In overtime, the Bears once again came out shooting as the Crimson repeatedly failed to clear the zone.
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