HARVARD — Maybe it was simply being in the cozy confines of its home gym, but the explanation behind Bromfield’s stunning 34-27 win over Ayer-Shirley on Monday goes far deeper than that.

In a previous meeting earlier in the season, Ayer-Shirley rolled to a 52-18 win, but a vastly improved Lady Trojans squad was up to the task the second time around.

Bromfield led at all the stops, 9-5 after one quarter, 15-12 at halftime, and 23-21 after three quarters. Ayer-Shirley appeared poised to complete the comeback, but the Lady Trojans saved its best for last, showing poise and scoring 11 points in the final quarter to pull away.

“Our defense was great today,” said Bromfield coach Sue Silver. “The kids have improved their man-to-man defense throughout the season and that was important today. Also, we finally boxed out well. I also liked the way we battled off the boards and our girls were aggressive and didn’t back off.”

Leading the way for Bromfield was Emma Sullivan, who scored eight points and rebounded well. She scored four points in both the first quarter, to key a strong start, and the fourth quarter, to seal the deal.

Seven other players scored for the Lady Trojans. Amanda Accorsi was a physical presence and finished with six points. Sofia Catalina, Meghanne Fitzsimmons and Lucy Opalka each scored four points. Amy Hunter scored three points, Molly Hart two, and Nicole Chapman one. Hunter turned in a strong defensive effort on the perimeter and did a good job of harassing the Ayer-Shirley guards.

“Meghanne, Molly and Lucy all rebounded well,” said Silver. “Offensively we were patient when we needed to be, but we tried to use the fast break when we could. Every girl on this team gets a minimum of seven minutes of playing time a game. I am very pleased with the way we have come along this season. Ayer-Shirley really came at us in the fourth quarter and applied a lot of pressure, but we played a very strong quarter and didn’t collapse under that pressure. I think this game showcases the progress that the team has made this season.”