Though actually triangular, Mitchel Square is a small urban park that features the war memorial seen here. The plot was initially dedicated as a public space in 1911 and named Audubon Square. On February 8, 1919, the square was renamed in honor of John Purroy Mitchel. Mitchel was elected the youngest mayor of New York City (a record which still stands) in 1913. The "Boy Mayor" was known for his idealism and (perhaps uncommon in politics) honesty. Following his mayoral term (he lost a bid for reelection in the primaries), he enlisted in the Army Air Corps. In 1918 while on a training flight in Lousiana, Mitchel fell from his plane and died.

The city (and state) mourned and eulogized the former mayor, naming this park after him, erecting a memorial at Fifth Avenue and East 91st Street, and naming a Long Island airfield for him. Theodore Roosevelt wrote of the man, “No stauncher American, no abler and more disinterested public servant, and no finer natural soldier than Purroy Mitchel was to be found in all our country.”

Four years after the park's renaming, this World War I memorial sculpture was installed. Dedicated on May 30, 1923, and designed by Gertrude Vanderbilt Whitney, this public arts still stands on the north side of the park, while the south side remains benches and rock outcroppings.