Carlisle manager Keith Curle praised his side's attacking threat after their 2-0 FA Cup first round win at League Two leaders Plymouth.
United took the lead through Antony Sweeney's overhead kick after Plymouth failed to clear Derek Grainger's free-kick and doubled their lead through Hallam Hope after Luke McCormick could only parry Derek Asamoah's goal-bound strike.
Curle said: "It was a well-deserved win. The team will build a lot of confidence from that clean sheet because Plymouth are top of the table. "We have worked on getting the ball in behind and utilising Derek's pace. Plymouth have been defensively sound, today we made them look fragile.
"You never go into any game thinking you are going to get a comfortable outcome. We showed them a lot of respect.
"Plymouth are rightly top of the league but we caused them some problems, and that was their full-strength team.
"We caused them some problems earlier in the season when we played here and today we got that little bit of luck. Sometimes you get those little bits of luck in the cup competitions rather than the league.
"We set our stall out early and said we are not going to sit back and invite pressure, we wanted to give them pressure to deal with at their end and that was to catch Derek."
Argyle boss Derek Adams admitted his side came up short but played down the Cumbrians' offensive threat.
He said: "We didn't play well enough today. We didn't create any chances, it wasn't the best game of football in the world.
"To be fair to them Carlisle got the two-goal lead and were able to hang on to it. We didn't put them under any sustained pressure.
"You have got to give credit to Carlisle, they took their time on the ball, got players behind the ball and were professional in the way they won the game.
"They broke up play, they stopped us playing, they did a good job on us."