Jersey came from behind to retain the Siam cup for an 8th consecutive year in a thrilling match at Footes Lane this weekend.
The Reds came from behind in the final minutes to break Guernsey hearts.
That despite the game being played under new rules restricting how many professional players Jersey could field.
Our sports reporter Chris Cunningham was there:
It was almost the perfect start for Guernsey, despite going behind early to a Aaron Penberthy penalty, they quickly found themselves 11 points up scoring two impressive tries through Cameron Craine and Adam Nixon.
For most of the first half they certainly looked like the side who wanted it a lot more, moving the ball well and willing to take risks.
Jersey composed themselves a little by the end of the first half and came back within a point after Nick Selway found the line behind a rolling maul.
Guernsey came out strong in the second and after Ryan Morgan was sent to the sin bin for a mistimed tackle, Guernsey made them pay by stretching their line. Sam Whitehead running in Guernsey's third try of the game.
But as the clock ticked away Guernsey's legs started to tire, Jason Batiste picked up a yellow and Jersey used the strength of their pack to twice push across the line after corner throw-ins.
The Reds put an exclamation mark on their win when Donovan Sanders crossed the line with only minutes to go, making their lead unassailable.
The final score 19-33.
Earlier in the day Jersey also won the second team game 47-12, but Guernsey took the veterans match 33-10 and retained the women's Siam Cup with a 41-12 victory.
In the Ladies' game Guernsey dominated from the out despite a very spirited performance from Jersey. Full Back Carly Parrott scored a brace of impressive tries for the Sarnians.
Guernsey have already beaten Jersey twice this year in NC South East South, but captain Kristine Vavere says a Siam victory is always that much more special:
There were scenes of jubilation from Guernsey after their victory but it was an emotional moment for many Jersey players, including their captain Laura Poingdestre who was playing her last ever game with the squad: