TRINITY School beat previously undefeated Berkhamsted School 27-12 in a physical NatWest Cup tie.
The opening exchanges formed the start of a fabulous contest between two schools, who played some entertaining rugby.
Berkhamsted scored in the corner with less than five minutes on the clock, but Trinity hit back two minutes later through a well-worked first-phase move that saw England wing Gabriel Ibitoye cross the line.
Towards the end of the first half, the power of the Trinity pack and their aggressive defence proved too much for Berkhamsted with Mofe Wilkey, Dom Augustus and particularly Callum Dougall making ground with every carry, plus a string of line breaks.
They went into half-time with a commanding lead of 24-5, thanks to further tries from full-back Bryan Hotston and fly-half Charlie Fatoma.
The second half was just as exciting, but with fewer points scored. Both sides set out to attack, but missed opportunities, and in the end it was Trinity who prevailed.
Director of rugby Aaron Liffchak was delighted with the performance, saying: "Our defence was outstanding, but it was our attacking lines and support that pleased me the most."
Director of sport Matt Richbell added: "It was another excellent performance from a very talented bunch of rugby players and a superb set of coaches. We are very proud of what they have achieved and we look forward to hosting Dulwich in the new year.
"Trinity versus Dulwich seems to have become a regular fixture in national rugby competitions and it is always a tense yet exciting game."