Barnet defied their League Two status as they knocked Championship side Portsmouth out of the Carling Cup.
Mark Hughes rewarded the Bees for their dominant play by putting them ahead on the half hour.
Portsmouth struggled to create any clear chances and were well beaten as Barnet ran out worthy winners.
It was another Cup upset for Bees boss Lawrie Sanchez, who scored the only goal for Wimbledon in their famous 1988 FA Cup win over Liverpool.
Pompey, whose depleted squad meant they could only name two outfield substitutes, crashed out of the first round for the first time in 10 years.
The Fratton Park faithful were stunned in the 29th minute when their side failed to deal with a corner, allowing former Northern Ireland midfielder Hughes to head Barnet into the lead.
It almost got worse for the hosts as Bees striker Jason Price had a goal ruled out for offside before Izale McLeod was denied by debutant goalkeeper Stephen Henderson.
The second half was better for Portsmouth as Aaron Mokoena went close and Dave Kitson and Hayden Mullins forced fine saves from Barnet keeper Dean Brill.
But Barnet held off late pressure to celebrate a famous win for the League Two outfit.