Pioneers’ defense dominates in Division 2 North semifinal win over Watertown

BURLINGTON — Wednesday’s Division 2 North semifinal between the No. 5 Lynnfield field hockey team and No. 1 Watertown was a year in the making for the Pioneers. Watertown, behind a questionable game-changing call, knocked Lynnfield out in last year’s sectional semifinal.  But this time the Pioneers came prepared and rose to the occasion, earning…