Bath Rugby crashed out of the Champions Cup at the Aviva Stadium as Leinster raced away for a commanding 47-21 win against the 14-men English side following a controversial red card for loose head prop Beno Obano early in the second half.

In an entertaining first half, Bath raced into a 14-0 lead with tries from Alfie Barbeary and Tom de Glanville; however, Leinster bounced back to score three tries as Robbie Henshaw grabbed a brace while Jack Conon also crossed. Bath took the lead at the break thanks to de Glanville's second, but the hosts ran away with the game with four second-half tries with a brace from replacement look RG Snyman with Garry Ringrose and Jamison Gibson-Park also crossing.

READ MORE: Johann van Graan addresses Beno Obano's controversial red card in Bath's defeat to Leinster

READ MORE: Johann van Graan addresses Beno Obano's controversial red card in Bath's defeat to Leinster

READ MORE: Bath Rugby player ratings from Leinster defeat - 'Stepped up to the occasion'

Bath could not have got off to a better start away to Leinster at the Aviva as they scored a try in under three minutes through Alfie Barbeary. Having caught the opening kick-off, Bath went about their business with real purpose and, despite the blitz defence, found some decent width with Finn Russell pulling the strings. A lovely wide pass from Rusell found Ted Hill in acres of space, with the flanker powering his way to within inches of line before the visitors recycled to give Alfie Barbeary and Bath a stunning start to go 0-7 up at the Aviva.

With the Aviva stunned to silence, the hosts needed to fire a shot of their own, but when Ollie Lawrence made an impressive defensive read and tackle, Bath pounced to force a 5m scrum. A free-flowing attacking move down the blindside gave Bath a second try with only 10 minutes on the clock as Tom de Glanville sliced through the Leinster defence.

However, they would soon be pegged right back as the hosts found their momentum as Jodie Barret burst through a gaping hole and with Jamison Gibson-Park's speed of ball from the ruck, Leo Cullen's men found a crucial try through Robbie Henshaw as the centre breezed in after a great inside ball from Hugo Keenan.

Leinster were finding their mojo, and when Joe Cokansiga's drop under the high-ball forced a poor Bath exit, the hosts sensed their chance for a second. Despite some great scramble defence, Leinster's ball speed was too quick for Bath as Henshaw grabbed his brace following some lovely hands from Barrett.

After a very bright start, Bath were starting to flounder with ill-discipline and poor exits, giving Leinster increasing possession in Bath's half, and when Josh van de Flier dropped inches from the line, the visitors looked to have survived a major test. However, a Beno Obano high shot on Gibson-Park saw the prop sent to the bin and gave the hosts another chance, which they took with ease as Jack Conon bundled over.

This Bath side is made of different stuff to ones that have travelled across the Irish Sea in recent memory and with time running out in the first half, Bath went for the score with Ollie Lawrence spotting a gap with a brilliant show and go before passing to De Glanville to take a stunning half-time lead at the Aviva.

Having suffered a slow start in the first half, Leinster came out swinging in the second; with Caelan Doris and RG Snyman entering the fray, and they upped the anti-with the South African showing his full bag of tricks in his offloading game. Quick ball followed, and suddenly Leinster were in again with Snyman pouncing.

In what was a positive first half for Bath, their Champions Cup hopes took an absolute beating with a disaster five minutes after the break as a failed tap and go from Dunn and Spencer saw a Bath 5m scrum turn into a Leinster one before back-to-back scrum penalties saw Leinster march up the pitch and Obano sent off with a second yellow card having gone down under pressure in the set piece battle.

Leinster added a flourish with two more tries as Snyman got his brace while Gibson-Park added to the pain.

Bath did try and secure a fourth try but failed to do so, but in the end it would not have mattered anyway as Benetton secured a memorable 32-25 win over La Rochelle. Van Graan's men will now enter the Challenge Cup in the last 16 knockout round.

Leinster Rugby: 15. Hugo Keenan, 14. Garry Ringrose, 13. Robbie Henshaw, 12. Jordie Barrett, 11. Jamie Osborne, 10. Sam Prendergast, 9. Jamison Gibson-Park, 1. Andrew Porter, 2. Ronan Kelleher, 3. Rabah Slimani, 4. Joe McCarthy, 5. James Ryan, 6. Max Deegan, 7. Josh van der Flier, 8. Jack Conan (c)

Replacements: 16. Gus McCarthy, 17. Cian Healy, 18. Tom Clarkson, 19. RG Snyman, 20. Caelan Doris, 21. Luke McGrath, 22. Ross Byrne, 23. Jimmy O'Brien

Bath Rugby: 15. Tom de Glanville, 14. Joe Cokanasiga, 13. Ollie Lawrence, 12. Max Ojomoh, 11. Ruaridh McConnochie, 10. Finn Russell, 9. Ben Spencer (c), 1. Beno Obano, 2. Niall Annett, 3. Will Stuart, 4. Quinn Roux, 5. Ross Molony, 6. Ted Hill, 7. Miles Reid, 8. Alfie Barbeary

Replacements: 16. Tom Dunn, 17. Francois van Wyk, 18. Thomas du Toit, 19. Charlie Ewels, 20. Josh Bayliss, 21. Louis Schreuder, 22. Orlando Bailey, 23. Jaco Coetzee

Referee: Luc Ramos (Fra)

Assistant referees: Thomas Charabas (Fra) and Jonathan Gasnier (Fra)

TMO: Julien Castaignede (Fra)