Makes sense. Though, I'm curious: What are some other "ww2 France"-tier failures throughout history?
Let's see...
Barbarossa comes to mind, though a large part of it was that the Red Army, having seen the massive breakthrough of mobile warfare (used by the Germans) and its victory over positional warfare (used by the French), the Soviet high command decided to do a massive restructuring and reorganization, and weren't expecting to get in a fight until late 1942 at the earliest. Plus, after Stalin's purges the officer corps was for crap. The USSR managed to recover from that mostly because they had a massive manpower pool, way too much territory to conquer quickly, and massive errors in German strategic doctrines that meant the early victories of 1941 ultimately meant nothing.
The big one I'm thinking of is the Japanese invasion of Korea, 1592-8. Korea had no experience fighting on land for a long time by then, true, but a lot went wrong that made things worse. The Korean navy just sat in port while the Royal Court was trying to decide if the massive Japanese fleet coming in was a trade delegation or a war fleet - which they found out was the latter only when they disgorged tons of Japanese troops onto Korean land and they started hacking and slashing the place up. And the Korean navy? Got scuttled in harbor after doing nothing.
Yi Sun Shin, the best and most underappreciated naval commander of all time, managed to turn this around by taking a few dozen ships and repeatedly sinking Japanese fleets many times his size, all while taking 0 losses in ships and a few casualties (mainly injuries, almost no deaths) every time. Then the Japanese tried to lure him into a trap by feigning a rift between two commanders and pointing out where a supply fleet was coming in. Yi didn't take the bait, knowing it was a trap, but his enemies in court said it was a sign he was a coward, and had him arrested, tortured, and demoted, and put a man called Won Gyun instead (Won Gyun being the man in charge of the Korean navy and did nothing when the first Japanese landing waves begun, then scuttled his fleet when the invasion began in earnest, btw). Won Gyun immediately took the bait - and surprise, surprise, it was indeed a massive Japanese trap. Won Gyun ordered a head-on assault, and when his navy got butchered, he had a nervous breakdown and couldn't issue orders. His fleet was annihilated, with only a dozen ships surviving from out of 150. In the end, they had to bring back Yi from his disgrace to fix those problems and rebuild the fleet almost from scratch. The fact that the Japanese
lost the Imjin War was almost entirely because Yi managed to turn things around again (only to die in the last, fateful Battle of Noryang).
There was also the infamous General Gideon "The Self-Inflating" Pillow, who was a friend of Jefferson Davis and got his ties to secure a military command. He surrendered two forts without a single shot, mostly by running away and saving his own skin. Hell, Grant, undersupplied and outnumbered, took Fort Donelson without a shot because he knew that Pillow would waste the entrenchments and fortifications surrounding the fort. Admittedly, that's cheating, since Gideon was immediately suspended following his horrible performance, and was only in command of a fort, not of a military theater.