I don't recall this thread, which started and was last updated in 2007. So having spotted the below quote provided by Outlaw09 on the Syria thread, I have re-opened the thread.

All the business of war, and indeed all the business of life,
is to endeavor to find out what you don't know by what you do. By the
Duke of Wellington
A Google search found a list including this quote, but not the context and oddly the website is devoted to Napoleon, ah well.
Link:http://www.napoleonguide.com/aquotes_welli.htm