It was always going to be a difficult night for Celtic as they travelled to the Allianz Arena to take on German champions Bayern Munich in the round three of Champions League group stage fixtures, and that's exactly how it proved to be for Brendan Rodgers' men as they slipped to a 3-0 defeat.
The home side were dominant from the off and, in truth, could have scored five or six, with two goals disallowed and Bhoys goalkeeper Craig Gordon making several top-class saves.
After their triumph against Anderlecht on the second match day, Celtic will feel a little deflated by the ease with which Bayern swept them aside, but Jupp Heynckes' side are capable of doing so to all except the very elite of the continent.
We studied proceedings in Bavaria with an analytical eye to highlight five tactical insights from the game, and here is what we found.
Celtic's Low-block Resistance Foiled
Rodgers set up his side to be compact, defend deep, and counter-attack when the opportunity arose – a basic blueprint for an underdog away from home.
The Boys utilised a low defensive block, pressing their opponents only when they approached the final third of the pitch in an effort to limit the space Bayern were able to work in.
The formation, on paper, was 4-2-3-1, but Celtic, having spent the majority of the game without the ball, deployed a 4-4-1-1 defensive shape, with wingers Scott Sinclair and Patrick Roberts dropping back to help form two distinctive lines of four behind Leigh Griffiths and Stuart Armstrong.
The plan was to frustrate Bayern, but the Bundesliga kings simply possessed too much quality on the ball. Their intelligent movement, the link play of Robert Lewandowski and Thomas Muller's ability to find space inside the penalty area overwhelmed Celtic.
Bayern's ability to pull the Celtic backline from side to side and exploit overloads enabled the home team to aim for goal 26 times in total.
Robben And Coman Lethal One-on-one
Bayern sought to feed the ball into the flanks, where Arjen Robben and Kingsley Coman aimed to face Celtic's full-backs up in one-v-one situations. Both wingers proved incredibly productive up against their respective markers, completing five dribbles apiece and combining for three key passes.
It was Celtic's failing in this instance that they could not offer greater support to left-back Kieran Tierney and right-back Christian Gamboa.
By and large, 20-year-old Tierney coped admirably with his task of shackling the veteran Robben, although the Dutchman was a constant creative outlet for his side. But Gamboa was given an altogether rougher ride by Coman.
Too often the pair were left to challenge the Bayern duo alone. Had Rodgers attempted to find a way to offer his full-backs support, doubling up on the dangerous wingers, they might have enjoyed more success in this area.
It is, of course, a Catch 22 situation, though: committing extra numbers to defend in the wide area would likely have left Celtic exposed centrally.
Griffiths Isolated And Ineffective
After a stellar performance leading the line in the victory over Anderlecht in September, Griffiths cut a much more isolated figure at the point of the Celtic attack against Bayern.
In the win against the Belgian champions, Celtic enjoyed the lion's share of possession and attacked with relative abandon. In that case, Griffiths' savvy movement and ability to link with midfield runners was an asset. He was afforded no such chances to demonstrate his skills against Bayern, though.
Defending deep meant that there was a greater gap between the Celtic midfield and Griffiths at the Allianz Arena than there had been against Anderlecht.
As the Hoops aimed to counter quickly, they would have been better served with either a target man capable of holding the ball up and awaiting support, or a pacy forward to offer an outlet in the channels; Griffiths is neither.
The introduction of speedy French centre-forward Moussa Dembélé seemed to offer Celtic another dimension in attack, and his pace, in combination with Sinclair down the left, provided a greater attacking threat.
Sinclair And Roberts Show Endeavour As Outlets
In the first half, Celtic found a modicum success via Roberts' direct and tenacious running. The on-loan Manchester City wide man's ability to carry the ball over 40-50 yards proved invaluable in not only showing attacking intent for the away side, but also in relieving pressure for Celtic.
Roberts' influence faded as the game wore on, and he was substituted after 77 minutes. But, by that point, Sinclair had picked up the mantle and, especially after Dembélé was introduced, caused problems for the Bayern backline.
The wings were clearly the avenue of attack that Rodgers had identified as being Celtic's path to success, and the wide pair performed admirably in their unenviable task of carrying the fight to Bayern.
Sinclair had the ball in the net late in the second half, only to be denied by the linesman's flag. He was, however, easily Celtic's most productive attacking player, completing three take-ons and three key passes.
Bayern Dominate Second Balls
One of the key ways that Bayern swarmed Celtic was in their dominance of second balls, with multiple forwards attacking any dropping ball within the penalty area to devastating effect.
Whether is was a headed clearance, a ricocheting deflection of a rebound from one of Gordon's fine saves, Bayern always seemed to have a man in the right place to profit.
It may appear pure chance, but this is something that was a major facet of Pep Guardiola's work on the field at Bayern's Säbener Straße training complex during his three seasons in charge in Bavaria.
The Catalan tactician drilled into his charges the optimum position from which to locate themselves in such situations, how to read the developing move and anticipate where the ball would fall, and how to then attack it effectively.