Bulldogs five-eighth Josh Reynolds capped off a man of the match performance with a 90 metre intercept try to seal his side's 24-12 grand final victory over Windsor in the NSW Cup at ANZ Stadium.

The Kogarah Marist product had a hand in everything - scoring two tries and setting up a third, as well as laying on stinging defence - in a dominant performance by the minor premiers.

A rousing defensive display in the first half, where the Bulldogs held their line for several repeat sets, was the catalyst behind the victory.

"We just defend our line like it's gold and we keep coming up for each other, and when they do make that error it's just the best feeling and we go off the back of that," Reynolds said.

The heavens opened as the players ran out for the second half and the game quickly descended into a dour affair with errors and conservative play taking over before Reynolds' brilliant intercept - which he admits left him feeling "absolutely dead".

"I've never run that far in my life," he said.

"I felt like I've been smoking for about 20 years, but it was worth it in the end.".

The Bulldogs dominated the first 40 minutes, taking a 16-0 lead into the break thanks to tries to Trent Cutler, Rhys Jack and Reynolds' first effort.

Manly-bound second-rower Daniel Harrison ran strongly, defended with vigour and was always looking for the offload, while Tim Browne and Corey Payne played the role of dual enforcers.

Browne left the field after 20 minutes with a dislocated finger but returned to great effect in the second half.

The game threatened to explode when Bulldogs interchange forward Payne and Windsor star Maurice Blair came to blows in the 47th minute - with Payne put on report for striking, and Blair leaving the field with a suspected broken jaw.

Windsor threatened a comeback with 20 minutes left when utility back Jesse Sene Lefao latched onto a pinpoint Craig Trindall cross field kick before Reynolds' intercept try ended the contest.

Windsor prop Aaron Sweeney was sin binned late in the fixture for a head-butt.

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