- Theo Walcott put Arsenal one up with an exquisite, thumping finish.
- Laurent Koscielny sent off in bizarre circumstances after giving away a penalty.
- Robert Lewandowski, who won the penalty, sent David Ospina the wrong way from the spot.
- Arturo Vidal, Douglas Costa and Arjen Robben rubbed an unhealthy amount of salt into Arsenal's gaping wounds.
- Dries Mertens gave Napoli the lead midway through the first half.
- Sergio Ramos equalised for the European Champions in Naples and also put them in front. Alvaro Morata rounded things off in stoppage time.
Full-time: Arsenal 1-5 Bayern Munich
Arsenal's Champions League campaign was ended in Germany, but they managed to squeeze in another bout of humiliation during the encore.
It all started so well when Theo Walcott fired past Manuel Neuer early in the first-half, but once again, the departure of Laurent Koscielny from proceedings - this time via a sending off - kicked off another capitulation.
Robert Lewandowski dealt the killer blow before Arjen Robben, Arturo Vidal and Douglas Costa ripped the Gunners' bruised carcass apart. The referee played his part in Arsenal's downfall, but Arsene Wenger's men are specialists in shooting themselves in the foot.
Into stoppage time at The Emirates Stadium, but there aren't many people in the ground to witness it.
Wenger's men are looking for a consolation but it's not forthcoming.
Bellerin tries to add a dash of comfort to the scoreline but drags his shot wide.
Arsenal's rare foray forward ends in disappointment, just like their European campaign.
Sanches picks out the fabulous run of Costa, who squares it for Vidal, and the Chilean can't miss. It really is that simple for Bayern right now.
GOAL! Arsenal 1-5 Bayern Munich (Vidal)
Bayern Munich almost get behind Arsenal again but Bellerin tidies up in the nick of time. There are more goals in this game for Ancelotti's men, if they want them.
Alaba flashes a dangerous cross across the face of goal that only needed a touch. Bayern playing exhibition football now.
Mustafi's loose pass is picked up on by Alonso. He rolls it into the path of Vidal, who fools Ospina by chipping the ball decadently over the Colombian and into the net.
It's embarrassing again from the Gunners.
GOAL! Arsenal 1-4 Bayern Munich (Vidal)
Costa picks up the ball in acres of space on the right hand side, drifts towards the area and evades Mustafi before curling an exquisite effort into the bottom corner.
Excellent from the Brazilian who had only just entered the field of play. Bayern's other substitutions have just been made, Kimmich and Sanches are on for Ribery and Thiago.
GOAL! Arsenal 1-3 Bayern Munich (Costa)
The game is being played out under the thumb of Bayern. The Gunners haven't let their heads drop and are trying to probe but the Germans are comfortable and utilise the space when they can.
Lewandowski almost compiled Arsenal's misery with a third but his shot cannoned off the post. He then races clear of Xhaka but his touch fails him as the ball rolls to Ospina.
Arsenal make a triple change with Coquelin, Ozil and Perez set to be introduced.
Aaron Ramsey, Olivier Giroud and Alexis Sanchez make way.
Despair for Arsenal.
Jubilation for Bayern...
Arsenal fail to clear on a number of occasions and are made to pay when Robben robs Sanchez and finishes expertly past Ospina.
The Dutchman scored the opener in Munich and has helped seal Arsenal's fate in London. He is set to be replaced by Douglas Costa.
GOAL! Arsenal 1-2 Bayern Munich (Robben)
Bellerin's distribution has been very disappointing this evening. Time and time again he gets himself into a dangerous position but his delivery or pass constantly lets him down.
Ospina produces a fine save from Lewandowski, who combined brilliantly with Vidal. The Pole's movement so impressive at times, glides along the ground.
Javi Martinez almost gives Bayern the lead on the night after some excellent work from Thiago, but the Spaniard puts his effort on the roof of the net. Bayern in cruise control at the moment.
GOAL! Napoli 1-2 Real Madrid (Ramos)
Oxlade-Chamberlain bursts forward for the Gunners but is stopped in his tracks and eventually shown a yellow card for kicking out at Rafinha. Frustrations boiling over.
The moment Arsenal's Champions League hopes were ended for good.
Lewandowski effectively kills the tie, sending Ospina the wrong way from the spot. A shame.