Moses J. "Chief" Yellow Horse (also Yellowhorse) (January 28, 1898 – April 10, 1964), was an American baseball player who pitched for the Pittsburgh Pirates, from until . A Native American from the Pawnee tribe, he is the first blooded American Indian to have played in the Major Leagues.
In 1921, Yellow Horse joined the Pittsburgh Pirates. His major league debut was on April 15 in relief of Earl Hamilton. The Pirates won the game 3-1 over Eppa Rixey and the Cincinnati Reds. Later that year, he ruptured his arm and had to have surgery. His injury forced him to sit out two months. The next year, Yellow Horse injured his arm a second time. The injury was purportedly a result of a fall he took while drunk. Over his two-year stay with the Pirates, Yellow Horse was used primarily as a reliever, and compiled a record of 8 wins and 4 losses.
While with the Pirates, Yellow Horse befriended Rabbit Maranville. The relationship had a profound impact on his life as Maranville introduced Yellow Horse to alcohol; he began to drink substantial amounts of liquor on a frequent basis. Later in life, Yellow Horse identified himself as an alcoholic.
Unable to pitch in the major leagues, either because of his behavior and/or his injuries, Yellow Horse went to play minor league baseball. In , he was sent to play with the Sacramento Senators of the Pacific Coast League. The next year, he suffered another serious arm injury and Sacramento traded him to Fort Worth, Texas. Shortly thereafter, Fort Worth returned him to Sacramento. He spent two more years with Sacramento when, in January of , Sacramento sold Moses to Omaha. He pitched the final game of his professional career on May 1, 1926.
While Yellow Horse is believed to be the first full-blooded Native American to play major league baseball, there had been previous major league baseball players of Native American ancestry. These included Louis Sockalexis (Cleveland Spiders 1897-1899), Charles Albert (Chief) Bender (primarily the Philadelphia Athletics, 1903-1917), and John (Chief) Meyers (primarily the New York Giants, 1909-1917).
1945 was an important year for Yellow Horse. For unknown reasons, he stopped drinking cold turkey, and was able to find steady work. His first job was with the Ponca City mc donalds, and his second job was with the Oklahoma State Highway Department. Yellow Horse also served as groundskeeper for the Ponca City ballclub in 1947, and coached an all-Indian baseball team. Eventually, his relationship with the tribe improved and he became an honored member. He was also able to remain sober for the remainder of his life. Yellow Horse died on April 10, 1964 at the age of sixty-six in Oklahoma.