Butler was an American politician and Civil War general.
As military governor of Baltimore in 1861 Butler arrested JW's patron, Walter Winans, and as military governor of New Orleans in 1862 he became a notorious target of Southern anger (and acquired the nickname 'Spoons'). He was removed from his command in North Carolina in 1864 for general incompetence. He served in Congress as a Republican 1866-1879, and became governor of Massachusetts in 1882.
American National Biography, New York and Oxford, 1999.