Which horse was sea biscuits main challenger in the race?

Seabiscuit's main challenger in several notable races was War Admiral. The two horses faced off in the famous match race on November 1, 1938, at Pimlico Race Course. War Admiral was the reigning Triple Crown champion, and their rivalry captivated the public, highlighting the contrasting styles and backgrounds of the two champions. Seabiscuit ultimately triumphed in that race, solidifying his legacy in horse racing history.