Marginson's men made light of the fact they lie 29 places below Bridge in the non-League pyramid to deservedly advance to the Cup's fourth and final qualification stage for the first time in the club's brief but colourful history.
Jerome Wright was FC's match-winner, firing high past Celts' keeper Paul Phillips in the 33rd minute after Carlos Roca's free-kick had fallen invitingly to him on the edge of the box.
Stalybridge struggled to respond, although they might have had an equaliser late on when skipper Keith Briggs somehow contrived to shoot straight at Sam Ashton.
The only blot on FC's copy-book was a red card shown to Adam Carden seconds after the game had finished after he appeared to confront a crestfallen opponent.
Said Marginson: "This has to be one of our finest hours and all credit to the boys for performing so magnificently on the night.
"Few people would have expected us to come here and win after Bridge held us at our place on Sunday, but I always had faith in our players and I don't think many of the 1,923 fans inside Bower Fold would argue we weren't worthy winners."
Meanwhile, Cup minnows Salford City themselves now face a replay at Blyth Spartans next Tuesday after holding the Geordies 2-2 at Moor Lane.
The UniBond North side twice trailed to goals by Steve Harrison (10 mins) and Mark Doninger (25), but hit back on each occasion, first through Ian Fitzpatrick (12) and then Rhodri Giggs (42).
The winners will entertain AFC Telford.
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Prestwich Red, Prestwich (13/10/2009 at 23:26)
Lower Broughton Soul, "In 76, oh yes it's true......" (13/10/2009 at 23:58)
Crackin draw for Salford against Blyth. Will be up there for the replay.
Anyway, Roll on Northwich. A win there and who knows.......
Si, East Manchester, Audenshaw (14/10/2009 at 00:24)
fuzzy dunlop (14/10/2009 at 01:22)
ashton utd in the fa trophy up next on saturday
vegas-blue, Stalyvegas (14/10/2009 at 09:28)
Free Red, Manchester (15/10/2009 at 01:07)
£5 concessions
Directions From M62: Exit at Junction 20, take A627M to Oldham exit (2.5 miles). Take A627 towards Oldham town centre. At King Street Roundabout take Park Road. Continue straight onto B6194 Abbey Hills Road. Follow A6194 onto Lees Road. Turn right at the Stone Cross Memorial and then first right into the ground.
From M60. Exit at Junction 23, take A635 for Ashton town centre. Follow by-pass to B6194 Mossley Road. At traffic lights turn left into Queens Road, continue onto B6194 Lees Road. Turn left at the Stone Cross Memorial and then first right into the ground.
There is no car parking at the ground.
By Rail: Nearest Railway Station Ashton-under-Lyne. Train service direct from Manchester Victoria every 30 minutes Approx 10 minutes journey time, check with train operators for exact timings.
By Bus: Nearest Bus Station – Ashton-under-Lyne. Bus service to ground via number 39, 331 or 333 services (services at 20 minute intervals) Approx 10 minutes journey time.
vegas-blue, Stalyvegas (15/10/2009 at 09:52)
Si, East Manchester, Audenshaw (17/10/2009 at 20:31)
Free Red, Manchester (18/10/2009 at 09:17)
The Reds continued this season's great cup form by easing past the Robins at Hurst Cross. Marsh broke the deadlock on 22 minutes with a tap-in, Tong doubled the lead three minutes before half-time with a long range screamer and although Ashton pulled one back through Matty O'Neill seconds later, Roca sealed victory with 20 minutes to go.
The next round is scheduled to take place on Saturday 31 October and United will discover their opponents when the draw is made around 12 noon on Monday