Portsmouth beat Wycombe Wanderers 1-0 away at Adams Park on Saturday, moving themselves into the top half of the table and their celebrations drew the ire of opposition manager Gareth Ainsworth.
Despite a poor first half, Danny Cowley’s side managed to get the better of the Buckinghamshire outfit who were plying their trade in the Championship last season.
They conceded a penalty midway through the first half when Sean Raggett fouled Anis Mehmeti but goalkeeper Alex Bass was on hand to save Joe Jacobson's poor effort.
A much-improved performance by Pompey after the break brought reward in the 73rd minute when Hirst laid the ball across for Harness, who needed a couple of goes at forcing the ball over the line.
Goalkeeper Alex Bass proved to be the hero as he kept out Sam Vokes' late header, ensuring a clean sheet and three points went back with Portsmouth.
The result left opposition manager Gareth Ainsworth bitterly disappointed, as he told media in his post match presser: "They’ve celebrated in their dressing room like they’ve been promoted, never mind winning 1-0 today, and that’s all respect to Wycombe Wanderers, so fair play to them.
"They’ve come here and did a job, even though I thought we were better in spells.