Lincoln's Spymaster Allan Pinkerton

[wpbinzel]

See if your library has a copy of "The Secret War For the Union" by Edwin Fishel.
Especially Chpt. 5 entitled - Mr. Pinkerton's Unique Arithmetic.

Excellent cite, Gene. In addition to Chapter 5, Chapter 6 deals with McClellan's missteps on the Peninsula because of his (willing) reliance on Pinkerton's "intel." Also, see Appendix 6, on pp. 581-7.