Probably one of the more difficult problems for the historian is the discernment of those personal qualities and characteristics that hear the performance of the successful military commander. Mahan, in analyzing types of naval officers, found they "by natural characteristics arrange themselves in pairs--presenting points of contrast, in deficiencies and excellence which group together, not by similarity chiefly, but as complementary."
O'Connor, Raymond G.
"Reflections on the Charecteristics of a Commander,"
Naval War College Review: Vol. 21
, Article 4.
Available at: http://digital-commons.usnwc.edu/nwc-review/vol21/iss7/4