Rothman took his chance at Fontwell to kickstart his chasing career.
The Paul Nicholls-trained five-year-old had disappointed in his two starts over fences this summer.
But he opened his account in style in West Sussex as he beat odds-on favourite Mile House by 12 lengths in the Invest With Confidence At selftrade.co.uk Beginners’ Chase.
Having hit the front at the 10th fence, the son of Michel Georges – who returned a 3/1 starting price – quickened clear before he was eased down by jockey Sam Twiston-Davies on the run-in.
Elsewhere on the Armed Forces Raceday, Jonjo O’Neill saddled Church Field to a 4/1 success in the International Payment-First Past The Post Handicap Hurdle.
The Equiniti Fintech For Wealth Solutions Mares’ Novices’ Hurdle went to 9/4-shot Native Princess, with 10/11-favourite Dry Ol’Party having to settled for second spot.
Quadriller justified his status as 9/4 favourite with victory in the Equiniti shareview.com Handicap Chase.
Popping Along (2/1) beat even-money favourite Royal Battalion in the Selftrade Simply Smarter Investing Handicap Hurdle.
Rusty Nail was a 20-length winner of the Equiniti International Payment Handicap Chase at 9/2.
And the final race – the Equiniti International Payment Handicap Chase – was won by Lee Side Lady at 5/2.