In doing so, he also appear to improve the chance of the Gordon Elliott-trained Triumph Hurdle favourite Pied Piper, who beat him in their Grade 2 Leopardstown meeting over Christmas.
That was, however, Vauban's racecourse debut and one of many things to look forward to during Cheltenham Festival week will be waiting to find out which of the pair has improved the most come the day of the juvenile blue riband.
Among his victims at Leopardstown was Elliott-trained Fil Dor, who had been favourite for the Triumph prior to last week's impressive display by his stable companion. Beaten for the first time today, Fil Dor now finds himself behind both last week's winner and today's scorer in the market for the juvenile championship.
Fil Dor had done nothing wrong over hurdles prior to this Grade 1 assignment, winning all three starts including a Grade 2 over Christmas.
Understandably he was sent off the 6-5 favourite with Vauban a 9-4 chance.
Vauban's jumping could have been slicker, but when Paul Townend moved him into contention on the turn from home, he made Fil Dor looked decidedly one-paced.
The Rich Ricci-owned Vauban pulled three lengths clear and is now 11-4 second-favourite for the Triumph Hurdle with Betfair behind 5-2 market leader Pied Piper. Fil Dor was pushed out to 6-1.
A jubilant Ricci said: "When I saw what Pied Piper did I was hoping he'd come on and there's more to come, I think. That was very impressive for a four-year-old."
Mullins - who was on the mark in the opening race of the Dublin Racing Festival with Minella Cocooner - said: "His form, after his run in Punchestown, was looking very good. I thought if Paul got him jumping today he could improve hugely on his Punchestown form, which he did.
"It's tremendous to win another Grade One. We're delighted he won today, put it all together and he learned and got his experience today. It's a nice way to break your maiden.
"I don't know if many horses have broken their maiden in a Grade 1, but it's a nice achievement for him anyhow.

We thought he was a nice horse when we bought him. We just had to teach him how to jump and we eventually got around to that.

"It's tremendous for Rich and Paul and all connections."
Townend added: "He's a horse we like. I was disappointed I got beaten on him the first day - we might have made up for that today."