John Cleveland Robinson had a long and distinguished career in the United States Army, fighting in numerous wars and culminating his career as a Union Army brigadier general of volunteers and brevet major general of volunteers in the American Civil War. In 1866, President Andrew Johnson nominated and the U.S. Senate confirmed Robinson's appointment to the brevet grade of major general in the regular army. He was a recipient of the Medal of Honor for valor in action in 1864 near Spotsylvania Courthouse, Virginia, where he lost a leg. When he retired from the U.S. Army on May 6, 1869, he was placed on the retired list as a full rank major general, USA. After his army service, he was Lieutenant Governor of New York from 1873 to 1874 and served two terms as the president of the Grand Army of the Republic.

There were four formations in the Union Army designated as III Corps during the American Civil War.