In September she beat a field which included the Derby winner Straight Deal to win the St Leger Stakes over one and three quarter miles.
[1] She was sired by King Salmon, a descendant of the Byerley Turk, who finished second in the 1933 Epsom Derby and went on to win the Eclipse Stakes and the Coronation Cup.
[5] Herringbone began her three-year-old season in the seven furlong Upwell Stakes, a now discontinued race which served as a trial for the 1000 Guineas.
On her next appearance she started at odds of 15/2 in a field of twelve fillies for the "New" 1000 Guineas, run on Newmarket's July course rather than its traditional home on the adjoining Rowley Mile.
[4] In the Whepstead Stakes, a trial race for the St Leger, Herringbone finished second to the Derby runner-up Umiddad, with Ribbon fourth.
Straight Deal took the lead inside the final furlong but was challenged and overtaken by Ribbon who looked sure to win until Harry Wragg produced Herringbone with a strong run in the last few yards.
With no photo-finish in operation, the result was decided solely by the racecourse judge, Major Petch, and although most observers believed that Ribbon had won,[4] the race was awarded to Herringbone by a head.
She produced eight winners including Dogger Bank (Princess of Wales's Stakes) and Entente Cordiale (Doncaster Cup) as well as Hylander who was a leading racehorse and sire in Venezuela.