Swindon will meet Chesterfield in the Johnstone's Paint Trophy final at Wembley after beating Barnet 1-0 at The County Ground.
After a 1-1 draw in the first leg, the home side made their numerical advantage count after 17 minutes - with Barnet's Mark Hughes off the field receiving treatment - as Alan Connell found space to meet a perfect delivery from Paul Caddis.
The Robins had chances to extend their lead before the break, with Barnet goalkeeper Dean Brill on hand to deny close-range efforts from Raffaele De Vita and Paul Benson.
Despite making a resilient beginning to the second half, Barnet failed to create any openings, with leading scorer Izale McLeod isolated.
Town's highly-rated Matt Ritchie continued to create openings for the home side, causing the Bees problems on the wing.
A goal down in the tie, Barnet's hopes worsened after 85 minutes when substitute Charlie Taylor, who had been on the pitch for just 10 minutes, was shown a straight red card for a foul on Oliver Risser.
Connell's solitary strike was enough for Swindon to progress to the final, with Barnet rarely causing any problems.