Eagle was born in Maury County, Tennessee.[1] His family moved to Arkansas early in his life and he was educated in the public schools. He married Mary Kavanaugh Oldham in 1882.[2] Her brother William Kavanaugh Oldham moved to Arkansas in 1885 and later entered politics himself, serving as acting governor for a brief time in 1913. A younger brother, Kies Oldham, served as Eagle's personal secretary during his time as governor.
At the conclusion of the war, Eagle attended Mississippi College for less than one year but was forced to withdraw due to illness. He studied for the ministry and was ordained as a Baptist preacher.[3]
Eagle was elected Governor of Arkansas in 1888, and was reelected for a second term in 1890.[4] The Eagle administration concerned itself with attracting immigration and support for education. Eagle was sympathetic to women's suffrage and once welcomed Susan B. Anthony to the state though he did not provide active political support.
Eagle served on the state capitol commission but was fired by Governor Jeff Davis for allegedly campaigning for an opponent of Davis. Davis was opposed to the construction of the new capitol building.
Ministry
In 1880, he became president of the Arkansas Baptist Convention until 1904.[5] In 1902, he became president of the Southern Baptist Convention until 1904.[6]