Google Maginot Line, and extrapolate that to the rest of the French plan of battle to deter the German invasion of France...how and how long did it work.
The Nieuport and Spad were good against the Huns...but that was in WW1, French bicycles couldn’t fly in WWII.
The Maginot line was a good idea but it stopped 300 miles short. The French were using a 1914 tactics while the Germans were using the tactics of 1940.