Coffin was one of the best-known newspaper correspondents of the American Civil War. He has been called "the Ernie Pyle of his era," and a biographer, W.E. Griffis, referred to him as "a soldier of the pen and knight of the truth."
^Clarke, James W. (1885), The Granite State Monthly: A New Hampshire Magazine Devoted to Literature, History, Biography and State Progress Vol. III No. 1, Boston, Massachusetts: Bay State Monthly Company, p. 276
^Clarke, James W. (1896), The Bay State Monthly: A Massachusetts Magazine of Literature, History, Biography and State Progress Vol. XX, Concord, NH: Granite Monthly Company, p. 3