Danish opponents FC Midtjylland, runners up in their domestic league last season, won this Uefa Cup preliminary round first leg tie at a canter.
The visitors turned up the heat after the break to convert a narrow 2-1 half time lead into an insurmountable advantage they will take into the return in a fortnight’s time.
The visitors, with Danish and Romanian internationals Mikkel Thygesen and George Florescu in their starting line-up, wasted no time in taking the game to Bangor, who were forced to defend two corners in as many minutes.
And the Welsh side were fortunate not to go behind in the eighth minute when Jonas Boring, who had previously demonstrated his devastating pace, was too quick for defender Dave Swanick and hammered in a fierce shot that goalkeeper Paul Smith did superbly well to turn behind.
City were struggling to cope with the speed and accuracy of their opponents’ passing and Smith again came to the rescue in the 13th minute.
He made two point-blank saves in rapid succession from Thygesen, who held his head in his hands after squandering the second opportunity from just two yards out.
With Bangor having few opportunities to create anything going forward it was not until the 18th minute that the Danes looked vulnerable at the back, Kolja Afriye slicing an attempted clearance just over his own crossbar.
But from the corner Midtjylland broke quickly and within 60 seconds they were rewarded with the opening goal of the game.
Florescu did the spadework down the right before picking out an unmarked Thygesen who made up for his earlier misses with a firm finish.
The goal did nothing to silence the vociferous Welsh fans and City responded superbly to get back on terms five minutes later. Afriye conceded a free kick 25 yards out and when Marc Limbert’s effort was only partially cleared, Les Davies pounced on the loose ball to fire home the equaliser.
For the first time, the visitors looked less than confident and Ashley Stott went close to adding a second in the 32nd minute when he just beat goalkeeper Lasse Heinze to the ball. But a challenge from Afriye took the pace off his shot and Heinze was able to gather.
It proved a temporary blip however and as the Danes imposed themselves again Smith was once more called upon to deny Petter Fureseth with a well-timed block before saving with his legs to deny Thygesen a second goal.
But the City was defence was caught napping five minutes before the break. Florescu’s corner was only cleared to the edge of the penalty area where lurking defender, New Zealander Winston Reid, somehow steered his shot through a crowded penalty to beat the unsighted keeper.
There was more urgency in the home side’s play following the restart, but as they pushed more men forward they left huge gaps at the back and their opponents were quick to exploit the space.
They increased their lead when a superb three-man move in the 53rd minute, begun by Florescu and continued by Boring, gave substitute Kim Christensen an easy finish at the far post.
And within four minutes the Danes had wrapped up the game, Christensen again giving Smith no chance after more fine footwork from Thygesen created the opening.
The energy visibly drained from City and as more mistakes crept into their game Christensen completed his hat-trick within 10 minutes of replacing Ken Fegrberg, again from close range.
No-one could accuse the Welsh side of throwing in the towel, but it was no great surprise when Smith was beaten yet again in the 72nd minute as Thygesen grabbed his second on a night that Powell will want to quickly forget.
The manager said: “They (the Danish side) were a joy to watch. I don’t think they crossed the ball all night.
“It was a harsh lesson but it will serve as a good experience.
“We can now look forward to the second leg.”