War Admiral
Retired to Keene's Castleton Farm, in 1917 Sweep was the leading sire of two-year-olds. He was the leading sire by earnings of all horses in 1918 and again in 1925. He was a great sire and broodmare sire, with three daughters that produced Kentucky Derby winners. They were Beaming Beauty, dam of Bubbling Over; Brushup, dam of War Admiral; and Dust Whirl, dam of Whirlaway. Both War Admiral and Whirlaway became Triple Crown champions.