If you will not fight for right when you can easily win without bloodshed; if you will not fight when your victory will be sure and not too costly; you may come to the moment when you will have to fight with all odds against you and only a precarious chance of survival. There may be even a worse fate. You may have to fight when there is no hope of victory, because it is better to perish than to live as slaves."
--Winston Churchill
Come on, you sons of bitches! Do you want to live forever?
-- GySgt. Daniel J. "Dan" Daly, USMC; near Lucy-`le-Bocage as he led the 5th Marines' attack into Belleau Wood, 6 June 1918
My center is giving way, my right is in retreat; situation excellent. I shall attack.
-- Ferdinand Foch
While the Sgt. may well have said that, Frederick the Great said almost the exact same thing. I wouldn't be surprised if someone else didn't say it before Frederick.
Speaking of Winston Churchill, here's one: (actually an exchange between Churchill & Lady Astor)
Lady Astor: "Winston, if you were my husband, I'd put poison in your coffee."
Churchill: "Nancy, if I were your husband, I'd drink it."