Crawley boss Richie Barker backed his side to continue humbling League One's big guns after Gary Alexander struck twice to defeat Preston 2-1 at Deepdale.
The Lilywhites were unbeaten in five league and cup games but had no answer to Alexander.
The 33-year-old striker headed Crawley in front in the 54th minute before crashing a superb shot past Thorsten Stuckmann four minutes later to seal the win despite Paul Huntington's late effort.
And after watching his side make it one defeat in six league and cup games, Barker insisted his side were not just there to make up the numbers.
"We've lost one in six, and that one was having been down to nine men. We had to erase that from our memory and move on. We're getting some major scalps at some major stadiums," said Barker.
"I know people probably won't like newly promoted little Crawley Town coming to big Preston, who are expected to go up, and winning the game having been the better side.
"We were 2-0 up and they scored in the last minute, so they were going to throw everybody at us. I thought we stuck at our task extremely well."
Barker clashed with opposite number Graham Westley after the final whistle and the Preston boss revealed his reasons behind losing his temper.
"He was screaming his mouth off - 'wahay we've won'! It was disrespectful," said Westley. "I made that point to him. You've won and fair play. I didn't need him screaming down my throat as if he's won the World Cup.
"They worked harder for the result than us. They showed why they won back-to-back promotions and why they're fourth in the table."