Re: George Washington named Britain's "greatest ever foe".
How about Russia and it's allies?
Hungarian born Gyorgy Schwartz forced the Bank Of England to near bankruptcy. You may know him as George Soros. He now finances terrorist groups that have been harmful to all the West's interests.
The Russian Intelligence Corps has, on several occasions, made Britain a laughingstock in the intelligence community, killing scores. Many feel that Russian influence is affecting policy and lawmaking to this day.
China has, on several occasions, embarrassed England, killing scores.
As far as Washington not being the smartest, who cares?
You don't need to be the smartest when God is on your side.
GAL 4:25 For this Agar is mount Sinai in Arabia, and answereth to Jerusalem which now is, and is in bondage with her children.
MT 24:43 But know this, that if the goodman of the house had known in what watch the thief would come, he would have watched, and would not have suffered his house to be broken up.
As opposed to the bad man that does nothing?
AMOS 6:3 Ye that put far away the evil day, and cause the seat of violence to come near;