--- Commander Randy "Duke" Cunningham, U.S. Navy, Vietnam, as cited in Robert L. Shaw, Fighter Combat, Tactics and Maneuvering (Naval Institute Press, 1985), x, as cited in Brian Strauss, The Battle of Salamis (Simon & Schuster, 2004), footnote on p. 176
This has been interpreted to mean that each and every fight has it's own special set of circumstances (here), or that everything is relative to the particular situation.