
A homebred for Stonethorn Stud Farm, Millisle has three wins and two second from five starts.
"As soon as Millisle hit the rising ground she lengthened her stride," said her trainer.
"At the start of the year I thought she was going to be our first two-year-old but she started to grow and got weak on me. She has always showed a lot of speed and before the race Shane (Foley) was looking towards the Commonwealth Cup but he said she will definitely stay seven and might get a mile."
Millisle is a half-sister to stakes-winning stayer Ithoughtitwasover and is the ninth winner from good producer Green Castle.
Millisle is the second Group I winner for Starspangledbanner, who stands at Rosemont Stud this spring at a fee of $22,000.