Although taking his Group race count to 3 Lord Shanakill was given a tough task in his victory in the Group 2 Betfair Cup at Goodwood.
With Tom Queally aboard, his race was won at the three pole, persistently wearing down the favourite Dalghar, who stayed on well and placed third.
Trained by Henry Cecil, the victor overtook the French raider and then fought well to beat back a fast challenge from Cat Junior ridden by Jamie Spencer, to get past the post first by a head.
Dunelight set a scorching pace early on in the event, with the most of the field sitting several lengths behind, except for Gerald Mosse, who put Dalghar on at the heels of the front runner.
Queally, who settled his mount in mid-division alongside Ryan Moore on Main Aim, who finished fourth, was one of the first to get to work as he battled to get a run.
Commenting after the race, Mike Marshall, Henry Cecil's assistant said, "He really deserved that, the confidence booster we gave him at Chester last time did just the trick.
"He's done everything right since and looked a picture today. He came here in terrific form and we'd have been disappointed if he was not in the shake up."
Queally noted, "It's good to get his head in front in what looked like a really decent affair. He's entitled to another crack at the top level, but that's not for me to say."
Brian Meehan, trainer of Cat Junior, stated, "I thought he was going to get up. All the seven furlong races for the rest of the autumn are there for him now. The Hungerford, Supreme and Park Stakes, hopefully he can take one of those."
George Rimaud, racing manager to the Aga Khan, said of Dalghar, "He was a little closer to the front than we hoped for and instead of coming from behind, he found himself in the opposite position. It was possibly a bit far for him."