Next up PAOK on Bohemians' splendid and uplifting European journey as they breezed into the Europa Conference League's third qualifying round with a performance that married the assured and the spectacular.
A rare Rob Cornwall goal edged the red and black in front before the break and, cheered on by 8,000 fans at Lansdowne Road, they were able to keep a bit in reserve for a daunting challenge against the Greek giants next week, Georgie Kelly grabbing yet another European brace in the second half.
With severe restrictions on attendances gradually relenting, Bohs will have to be content with the same number of spectators for the visit of the Thessaloniki outfit on Tuesday next, returning to a ground that they have taken to like a bee to a flower on a summer's day. Tickets go on sale tomorrow. They'll last about as long as this was a contest.
Dudelange offered relatively little and Bohs will have to play even better next week but they showed 12 months ago against Fehérvár in Hungary that when the task is upped their performance often follows.
Irish boss and ex-Bohs boss Stephen Kenny posed outside for photographs and autographs on a splendid day for the game in his homeland. Another former club, Dundalk, ensured their place in the third qualifying round alongside Shamrock Rovers by winning in Tallinn just before the game began on a pleasant evening in Dublin 4.
A foul on the ever-impressive Andy Lyons presented Ali Coote with an early dead-ball opening for the Dubliners, his shot too high. Coote then drove at Jonathan Joubert who wasn't convincing in blocking the ex-Waterford man's deflected drive with his feet.
Coote made an outstanding start and went down in the box on ten minutes but there was nothing doing. His cross was then headed wide by Georgie Kelly, the Scot's influence remarkably profound so far.
Coote then found Lyons whose teasing cross on 16 minutes caused some concern in the visitors' box, Tierney as ever lurking. Coote's superb backheel to Tierney on 18 minutes saw the latter's cross evade Kelly.
The Luxembourg outfit started to exert some control on proceedings as they entered the second quarter, without threatening. Dejvid Sinani had a pop inside the box but James Talbot had no issue dealing with it.
Liam Burt was exposed defensively and Kevin Can Der Kerhof blasted across goal but Sinani failed in his bid to connect.
They then showcased their threat with a memorable corner-kick routine that involved three dummies outside the box; it eventually fell to Samir Hadji, whose shot was straight at Talbot.
The opener came on 35 minutes. Anto Breslin, who had an excellent first half, whipped in a free-kick that big Cornwall headed home at the back stick.
Little happened of note in the first 20 minutes or so of the second half, though coach Keith Long would surely have preferred Bohs to have played with more attacking intent. By contrast, they seemed content to defend as they did for much of the second period in Luxembourg, their back four outstanding to a man.
Indeed, it was Ciaran Kelly, who was a rock throughout, who headed Coote's free-kick across to namesake Georgie on 69 minutes, the Donegal man continuing his amazing knack of goals at this venue without being at his best in general play.
Everything he touches in the box on this hallowed ground seems to precede a moment of magic.
That last sentence was written before Kelly's second, which owed a hell of a lot to the run of Liam Burt, who must have covered at least 50 yards before finding Kelly, whose finish was outrageously confident - which is exactly what the league's top scorer is right now.
The celebrations were testament to Bohs' work-rate, as Dawson Devoy looked like he might have sustained an injury, Breslin needed help for cramp and Tierney was planted on the ground by a rival just before Kelly's strike. They all managed to rise again: there was more fun to be had.
The visitors' best chance was wasted by Nélito Dos Santos Da Cruz with 11 minutes left. Georgie Kelly enjoyed a standing audience on 88 minutes as he made way for James Finnerty.
The prize for progression for Bohs is a further €300,000 banked to bring the guaranteed amount from this run to €850,000.
For those fans fortunate enough to bear witness to such nights as these, memories are priceless. There are more to come.
Bohemians: Talbot; Lyons, C Kelly, Cornwall, Wilson; Buckley (Levingston 75), Devoy; Coote, Tierney, Burt (Ward 84); G Kelly (Finnerty 88).
F91 Dudelange: Joubert; Delgado (Bojic 39), Cools, Diouf; Van Den Kerkhof, Morren (Kaboré 80), Dos Santos Da Cruz, Kirch; Bettaieb (Ninte Junior 79), Sinani (Muratovic 64), Hadji (Hassan Nader 64).
Referee: Gergo Bogár (Hungary).