Ruffian is one of the greatest fillies of all time. There is TONS of information on her - she was one of the greatest.
A book about her is "Ruffian - Burning From The Start" -- awesome read. Ruffian broke down in a match race with the top 1975 colt, Foolish Pleasure. She survived the surgery but coming out of the anesthetic began thrashing around, shattering the leg and making it impossible to save her. She is buried on the infield at Belmont Park.
http://www.thoroughbredchampions.com/biographies/ruffian1.htm
http://www.amazon.com/gp/product/1581500599/103-7962277-7062202?v=glance&n=283155
Ruffian won the 7 furlong Comely Stakes by 7 3/4 lengths, then ten days later the 1 mile Acorn Stakes by 8 1/4 lengths. Ruffian stepped up to 9 furlongs for the Mother Goose Stakes and sailed home an easy 14 length winner. In the mile and a half Coaching Club Stakes she went to the lead and stayed there. She did not even appear to be seriously extended during these momentary "challenges". Only one filly, Equal Change, could keep near in the closing stages, but Ruffian won by 2 3/4 lengths. It was 9 lengths further back to third placed filly Let Me Linger.
In the match race she had pulled ahead of Foolish Pleasure then broke down and had to be pulled up.
Sadly, within two years her parents met the same fate - Shenanigans (a daughter of Native Dancer) underwent colic surgery and broke two legs thrashing around coming out of anesthesia; Reviewer fractured a hind leg, got through surgery and 2 weeks later when the cast was being changed he, too, broke a leg coming out of anesthesia and had to be euthanized.
Ruffian was never headed in a race and set records in each race she won. She is a legend.