that Germany could be stopped
If you mean, "What crucial lesson was learned in the battle of Britain?" the best lesson learned is that the outnumbered Royal Air Force (RAF) ("Never before have so many owed so much to so few!") was able to successfully defend England primarily due to the Brits having the German code machine "Enigma."
With it the British radio intercept operators were able to know in advance the general location and times of the Luftwaffe attacks. The new invention, RADAR, then provided precise information about the time and location of the attacks. This allowed the RAF pilots to save time and "petrol" so they had only to go into the air immediately prior to an air attack. Thus they were able to rest and use their meager resources prudently and effectively. And the Battle of Britain was won, certainly by the Air Force but also by the radio intercept operators. The failure of the Luftwaffe meant Hitler could not invade England. This was the first of his major blunders. (The next was his invasion of Russia.)
Incidentally, the "Enigma" was also instrumental in solving the German Undersea Boat (U-boat) problem in the North Atlantic. English intercept operators were able to listen to German Headquarters assigning positions to the submarines throughout the Atlantic. US and English Anti-Submarine Warfare (ASW) forces were able to seek and destroy the submarines based on that information.
That Germany in fact, COULD be stopped!
Hitlers attacks could be blocked
Lesson learned: Britain rules the seas.
that hilter's advances could be blocked
That air superiority must be achieved before a land invasion can be successful.
They learned that air superiority is essential before a land invasion can be successful.
One lesson Meg learned was that love can overcome the battle of good vs. evil
The necessity for air superiority.
the south learned to block and the north learned nothing because they were perfecto
what is the lesson learned in The Treasure of Lemon Brown
History's first clash of carriers. Lesson learned: How to fight carrier battles
who was the protagonist in lesson learned by earl sewell
Lesson and Lessen. Something learned is "lesson"; to reduce is "lessen".
The lesson learned from the story "Young Goodman Brown" is depression
Never attack a well defended position on the high ground with numerically inferior forces.
a lesson learned.
what was the lesson learned in world war one
A Lesson Learned - 1911 was released on: USA: 7 June 1911
Another word for lesson is learned or taught a lesson
what lesson is was learnt in Bacon's Rebellion
I learned how to make the readers to stick to the writings.
The cast of Lesson Learned - 2004 includes: Jimmie Sizemore as Howard
Lesson Learned - 2004 was released on: USA: 11 November 2004 (limited)
Lesson Learned - 2005 was released on: USA: 2005 (National Film Challenge)