Man o' War (March 29, 1917 – November 1, 1947) was an American Thoroughbred racehorse who is widely regarded as one of the greatest racehorses of all time. Several sports publications, including The Blood-Horse, Sports Illustrated, and the Associated Press, voted Man o' War as the best American racehorse of the 20th century. During his racing career, just after World War I, Man o' War won 20 of 21 races and $249,465 () in purses. He was the unofficial 1920 American horse of the year and was honored with Babe Ruth as the outstanding athlete of the year by The New York Times. He was inducted into the National Museum of Racing and Hall of Fame in 1957. On March 29, 2017, the museum opened a special exhibit in his honor, "Man o' War at 100".

In 1919, Man o' War won 9 of 10 starts, including the Hopeful Stakes and Belmont Futurity, then the most important races for two-year-old horses in the United States. His only loss came at Saratoga Race Course, later nicknamed the Graveyard of Champions, where he lost by a neck to a colt named Upset.

Man o' War was not entered in the 1920 Kentucky Derby because his owner, Samuel Riddle, did not believe in racing at the distance of (one mile and a quarter) so early in a young horse's career. Instead, Man o' War made his three-year-old debut in the Preakness Stakes where he defeated Upset by lengths. Man o' War later won the Belmont Stakes by 20 lengths while setting a world record. Throughout the summer and fall, he continued to dominate his fellow three-year-olds, setting multiple records while conceding large amounts of weight to his rivals. The only time he faced older horses was in the final race of his career in a match race against Sir Barton, who had won what would later be known as the American Triple Crown in 1919. Man o' War won easily by seven lengths in the first horserace to be filmed in its entirety.

Riddle originally intended to race Man o' War in 1921 but decided against it because Man o' War would have been assigned record weights in the handicap format used in almost all races for older horses at the time. Instead, Man o' War was retired to stud, where he became a leading sire whose multiple champions included Triple Crown winner War Admiral. He was the grandsire of Seabiscuit and his sire line continues today through horses such as In Reality, Tiznow, Da' Tara and Tourist. Also successful as a broodmare sire, Man o' War is found in almost all modern American pedigrees.

Background Man o' War was a chestnut horse with a white star and stripe on his forehead. He was foaled at Nursery Stud near Lexington, Kentucky. He was bred by August Belmont Jr., whose father's accomplishments were recognized through the naming of the Belmont Stakes in 1867. Belmont Jr. was an equally notable horseman who served as the chairman of The Jockey Club from 1895 until his death in 1924. Belmont Park was named in the family's honor when it opened in 1905.

Man o' War was sired by Fair Play, a multiple stakes winner who finished second in the 1908 Belmont Stakes to the undefeated Colin. Man o' War was the second foal out of Mahubah, a lightly raced mare by English Triple Crown Champion Rock Sand. Not long after the colt was foaled on March 29, 1917, Belmont Jr. joined the United States Army at age 65 to serve in France during World War I. While he was overseas, his wife named the foal "Man o' War" in honor of her husband.. Originally, the Belmonts intended to race Man o' War themselves. However, in the summer of 1918 with the ongoing war effort, they decided to liquidate their racing stable. At the Saratoga yearling sale, Man o' War was sold at a final bid of $5,000 () to Samuel D. Riddle, who brought him to his Glen Riddle Farm near Berlin, Maryland. The underbidder at the auction was Robert L. Gerry, Sr., who is reported to have said to his wife, "Forty-five hundred is enough to spend for any yearling." Two years later in 1920, Riddle declined an offer of $400,000 for the horse.

At maturity, Man o' War stood , with prominent withers and a high croup, but was sometimes faulted for a dipped back that grew more pronounced with age. He had virtually flawless legs and solid bone, traits he passed on to his offspring. He had a slightly Roman nose and notably high head carriage. His nickname was "Big Red", though his coat had tinges of yellow and gold. An energetic, spirited horse, he is often pictured standing very still and gazing off into the distance, described as the "look of eagles". His stride was measured at 28 feet and, to this day, is believed to still be the longest of all time.

Racing career

Man o' War was the odds-on favorite in every start of his career and justified that faith even in his sole defeat. He typically won in front-running fashion and was only closely pushed in two of his starts. He won the Belmont Stakes by twenty lengths and the Lawrence Realization by a hundred lengths. He set record times in both of those races plus many more at distances ranging from . In many of his starts, he won under heavy restraint and often conceded his rivals large amounts of weight. He retired as the then-leading money-earner in American history.

Developing this talent was not easy for trainer Louis Feustel due to Man o' War's occasionally wild temperament. In his early days, Man o' War would routinely dump his exercise riders, once getting free for over 15 minutes after a morning workout. "He fought like a tiger," Riddle later recalled. "He screamed with rage and fought us so hard that it took several days before he could be handled with safety." Feustel brought the colt along slowly and gradually settled him into a regular routine. Man o' War developed a strong bond with his groom Frank Loftus, who taught the horse to fetch and to carry his hat. Oranges were Man o' War's favorite treat.

1919: Two-year-old season Man o' War made his debut at Belmont Park on June 6, 1919, in a maiden race over . At the time, horses raced clockwise at Belmont Park rather than counter-clockwise like all the other American tracks of the day, so horses had to learn to race in both directions. This practice ended in 1922 after Man o' War retired. He won his first race by six lengths, then three days later was entered in the Keene Memorial Stakes at a distance of on a muddy track at Belmont Park. At this point in his career, Man o' War had not yet learned how to start quickly but soon settled into fourth place. With an eighth of a mile remaining, jockey Johnny Loftus urged him to run and the horse responded by pulling away from his rivals to win by three lengths. Twelve days later, Man o' War followed up with another win in the Youthful Stakes at Jamaica Race Course. Two days after that, he swept to victory in the Hudson Stakes at Aqueduct to record his fourth win in 18 days. Less than two weeks later, he returned to win the Tremont Stakes at Aqueduct on July 5.

He was then shipped upstate for the summer meet at Saratoga Race Course, where the competition would be much fiercer. He made his first appearance there in the United States Hotel Stakes on August 2. Despite getting a bad start and carrying 130 pounds, Man o' War won by two lengths in his first meeting with a well-regarded colt named Upset.

His next start was the Sanford Memorial Stakes on August 13, where he went off as the odds-on favorite with Upset as the third betting choice. This race is notorious in racing history as Man o' War's only defeat, playing a part in developing Saratoga's reputation as the "Graveyard of Champions". In the early 1900s, there were no starting gates. Horses circled around and then lined up behind a piece of webbing known as the barrier and were sent away when it was raised.. In the Sanford, most sources state that Man o' War was still circling with his back to the starting line when the barrier was raised (though some accounts say he was turned only slightly sideways).. What is undisputed is that Man o' War had a terrible start, which The New York Times attributed to the absence of the regular starting official. The start was delayed for several minutes as other colts repeatedly broke through the barrier and the starter finally released the field when only the horses near the rail were ready. As a result, Man o' War was far behind the other starters. Loftus then put him in a bad position, getting boxed in by other horses, then checked by tiring horses. Despite this, Man o' War came close to winning, losing by about a neck while conceding 15 pounds to Upset.

It is sometimes erroneously thought that Upset's unexpected win popularized a new phrase in sports (meaning an underdog beating the favorite) – in fact, the term "upset" had been in use to describe such a situation for decades. The two horses faced off five times during their racing careers, with Man o' War beating Upset four times.

The loss only enhanced Man o' War's reputation. J.L. Dempsey of The Daily Racing Form wrote, "Without attempting to detract from the merits of [Upset's] performance, Man o' War proved himself in the running unquestionably the best. It was Upset's advantage at the start, coupled with 15 pounds weight concession, a perfect ride he received from Knapp and his success in saving ground on the stretch turn that brought his triumph over Man o' War. Had the race been a sixteenth farther the finish would have been reversed."

Man o' War gained his revenge with a victory in the Grand Union Hotel Stakes on August 23, beating Upset by two lengths with Blazes in third. After the race, Loftus stated that Man o' War was the best horse he had ever ridden and that his ride had been responsible for the loss in the Sanford. While carrying 130 pounds, Man o' War tied the stakes record of 1:12 2/5 for that had been set by Garbage while carrying only .

Seven days later, Man o' War entered the Hopeful Stakes, whose purse of $30,000 made it one of the richest prizes in racing at the time. He faced eight rivals, a small field at the time for such a prestigious race. Heavy rain started to fall as the field headed to the starting post, and Man o' War broke through the barrier several times, delaying the race by twelve minutes. Despite this, he won with "ridiculous ease" by six lengths.

Man o' War then returned to Belmont Park for the Futurity Stakes on September 14. The Futurity had a purse of $5,000 added, meaning the prize money was increased by nomination and entry fees. Because the Futurity was one of the preeminent races of the day, the added money was large enough to increase the winner's share of the purse to $26,650. Man o' War briefly dueled for the lead with a well-regarded sprinter named Dominique, then opened up a commanding lead. Turning into the stretch, John P. Grier swept into second with an all-out drive but failed to make up any ground on Man o' War, who had not been urged at any point in the race and won by three lengths while carrying 127 pounds, 10 pounds more than John P. Grier. Journalists, horsemen, and fans agreed that Man o' War had to be considered as one of the greatest American horses of his age, and they compared him favorably to the unbeaten Colin. He completed his two-year-old campaign with nine wins from ten starts and earnings of $82,275. He was named the American Champion Two-Year-Old Colt of 1919. He was rated at 136 pounds by handicapper C.C. Ridley of the Daily Racing Form, 16 pounds ahead of the second-ranked colt, Blazes.

1920: Three-year-old season In 1920, Johnny Loftus was denied a renewal of his jockey's license by The Jockey Club, a development that was rumored to be related to Man o' War's defeat in the Sanford. He was replaced as the colt's rider by Clarence Kummer. Over the winter, Man o' War had grown to high and filled out to about with a girth.Edward L. Bowen (2000), Man o' War: Thoroughbred Legends, Eclipse Press, USA, page 83, : states "he filled out to 1,150...height reached 16.2 hands".