Thayer, John Milton was born on January 24, 1820 in Bellingham, Massachusetts, United States. Son of Elias and Ruth Thayer.
Graduate Brown University. Studied law; admitted to Nebraska bar.
Brigadier general and major general Territorial forces operating against Indians, 1855-1861. Captured Pawnees and placed them on reservation, 1859. Colonel and brigadier general United States vols., 1861-1865.
Assisted General Sherman in operations against Vicksburg. United States senator, 1867-1871. Governor Wyoming Ty., 1875-1879.