I think it's about DIVINE protection and direction during the Revolution for freedom...Well, there definitely was plenty of that during the Revolutionary War -- witness, for instance, the providential fog that settled at the Battle of Brooklyn Heights, which allowed Washington and the army to escape across the East River. Even the Brits saw the hand of God in that.
Interesting....we learned in history class that because the British attacked in the center (or maybe to hte north...I get this confused) that Washington was able to escape. Nothing about fog. thanks for that info.