Warrington coach Tony Smith was delighted after his side withstood a second-half fightback to inflict a first home defeat of the season on Catalan Dragons and book their place in the last four of the Carnegie Challenge Cup.
The visitors led 20-6 at the interval but were pegged back to 20-18 at one point in the second half before securing the win.
Smith, whose side were beaten 44-16 in France in Super League on Easter Monday said: "It was a tough win and coming here is a tough thing to do, as everyone so far has found out this year.
"We knew what to expect having been on the other end of it, but we prepared well for the game and everything that we planned to do before the game pretty much happened.
"There were some massive differences from when we came at Easter. The flight that we got this time, we had an extra day here and we hadn't played a game three days before.
"We knew what to expect in terms of what game we were in for here. It is different playing the Catalans here compared to when you play them in England.
"When you have had a recent defeat - and from our point of view it was an embarrassing defeat for us not so long ago - that can be fairly inspirational motivation and I didn't have to do too much this week to get the boys ready for a big game against a team that can play some very, very good rugby league."
Catalan coach Trent Robinson said: "The execution of our plays was poor today.
"I thought Warrington were physically dominant in the first half and we weren't in a good rhythm in the first half and that put us on the back foot.
"I thought we got back into it in the second half. We started off the second half really, really well, just giving away some cheap penalties or not completing after a kick-off was poor.
"We played some really good footy early in the second half and we got straight back on to the front foot, but again our rhythm gets put off by not collecting a kick-off or not completing sets and they got some cheap tries on the back of that."