Ashley Harris was the hero as Pompey secured a morale-boosting 3-0 win over nine-man Crawley at the Broadfield Stadium.
Substitute Harris scored one and made one, with Luke Rodgers and Izale McLeod also on the mark.
It was a hard-fought Pompey success and for a long time never looked likely.
Michael Appleton’s men huffed and puffed in the first half, creating very little.
But once Crawley midfielders Josh Simpson and Hope Akpan had been sent off, it was one-way traffic.
Harris powered home a Webster cross on 74 minutes with a downward header.
Rodgers then fired home a fine free-kick for 2-0 on 83 minutes.
McLeod settled the contest two minutes later, after Harris played him through.
The striker rounded the Crawley keeper and slotted home to seal a cracking win.