With that game in mind, the Blues were understandably keen to strike a psychological blow. They achieved that courtesy of tries from captain Jake Thomas, Christian Dacey and Lloyd Williams, and three conversions and a long range penalty from Joe Deacon.
They led 15-12 at the interval with high performance manager Gafyn Cooper delighted with another excellent performance.
He said, "It was another great night for the boys. The staging of the game could not have been better and the crowd was far and away the biggest we have played in front of.
"They are a good side and made life really difficult for us, but we held on and Joe Deacon's penalty from half way earned us an excellent win."
In the other game, the Dragons recorded a 34-10 win over the Scarlets at Abertillery Park.
Ieuan Coombes (2) and Nathan Buck scored tries in the first half with Danny Ellis adding three conversions and a penalty for good measure. After the interval there was a further try from Kyle Price with Ellis kicking a conversion and dropping a goal.
Above all, high performance manager Ron Schottle was delighted with the all-round performance of a side that came under the guidance for the first time of recently-appointed coaches Gareth Lintern and Greg Woods.
"We had some outstanding individual performances from the likes of Rhys Jenkins, but I was pleased with the manner in which they played as a team. It has lifted the confidence and proves to us all that they are a good side."