Matt Harrold’s second-half penalty was enough to send 10-man Leyton Orient through to the third round of the FA Trophy with a 1-0 victory at fellow National League high-flyers Wrexham.

The striker converted from 12 yards in the 63rd minute after Wrexham captain Mark Carrington had fouled James Brophy, but the visitors had to see out the final 12 minutes plus injury time a man down following the dismissal of Myles Judd for a second booking.

Justin Edinburgh’s men suffered an early blow when the injured Marvin Ekpiteta had to be replaced by Jayden Sweeney and the hosts almost made the breakthrough when Luke Summerfield struck the post with a long-range effort.

New signing Jordan Maguire-Drew saw an effort from outside the box tipped away, while at the other end Charlie Lee threw himself to block a goal-bound effort from Luke Young.

The visitors almost made the breakthrough at the end of the opening period when Maguire-Drew put James Alabi in on goal, but he was superbly denied by Christian Dibble.

Orient did take the lead shortly after the hour mark through Harrold, but then looked to be forced on the defensive when Judd saw red for a challenge on Rekeil Pyke.

However, it was the visitors who had the next chances when substitute Josh Koroma twice fired wide from good opportunities.

Edinburgh’s men were made to defend in the closing stages and were successful in doing so as they advanced through to round three.

Leyton Orient: Brill; Judd, Ekpiteta (Sweeney 16), Happe, Elokobi; Maguire-Drew (Koroma 75), Lee, Lawless, Brophy (Gorman 83); Harrold, Alabi. Subs not used: Sargeant, Sotiriou.