
It was a first silverware for Mark Glazier's home-grown side who added this triumph to their second-place finish in the Hampshire Premier League table.
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As in previous weeks, they had to show character to come from an early goal behind - with Denmead struggling to deal with Liss aerial set-plays that produced three of the four goals.
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James Liddiard's looping header got Liss back level before they turned things around to lead into the interval through a second header - this time leading scorer, Angus Mackay finding the top corner for his 30th of the campaign from Theo Glazier's corner.
There were moments when Denmead almost punished Liss once more for defensive lapses, however goalkeeper Sam Waine produced a couple of tremendous saves to maintain this Liss advantage.
Jack Noble steamed in to head home from another Glazier corner in the second half to make it three which took the wind somewhat out of Denmead's sails.
Substitute Alfie McWilliams made it a birthday to remember in coming off the bench to add gloss to the final score, finding the bottom corner from Mackay's through pass.
Denmead ended the game with nine following two late red cards to add to their woes, but the day belonged to Liss with a coming-of-age victory for their young side in what has been another year of progress for the Blues.
Liss have received a walkover for this Wednesday's final league encounter scheduled at Newman Collard - also with Denmead - the visitors unfortunately unable to raise aside.
It completes another season of progression across the club, with the reserves also enjoying success in winning the Hampshire Combination Cup.
Liss Athletic: Waine, Liddaird, Noble, Clark, Evans, King, Kracmar, Glazier, Anelay, Harrison, Mackay. Subs: Ankers, Kay, McWilliams, J. Butler