Oh, please do keep in mind that I'm trying my best to boost myself in face of the defeat

I don't have complaints about the whole thing: After all, if France could actually beat Germany easily, it would make for a pretty non-interesting game for all the other players.
Well, one thing about the air power actually. I know that part of the Blitzkrieg success was the close air support that was offered. In practice though, there wasn't really an air dominance on either side. No complaints about French tank divisions: They worked well enough. I admit I did exagerate about the 1936 divisions

I actually have no idea about which quantity of 1936 and 1939 I had, I only know I had some of both types left, and that I still had a fairly substancial upgrade budget. Starting in May would have helped a lot for that, though.
What I still don't understand though is how Paris nearly fell in the first attack. 70 troops in good condition (Including 9 medium tanks, with 3 more in reinforcements before fight's end), against 118 attacking from 4 provinces, but were attacking across the water in all cases, two of the four provinces were counter-attacked for 2 days, they had stacking penalities, and there were bombers active. Normally, I would have considered that as an easy defensive win, but up until the last hour it wasn't certain who would win (I thought I was losing all the way actually, but still tried all I could...). So what happened? Did I misjudge the number of millitia in the Paris defense army? Inferior leader? Inferior doctrines? A key gameplay element I'm not aware of?
For the sudden collapse of the Belgium front and early France, I know that I joint counter-attacked too much and weakened my defenses to nearly nil by doing it. I'm used to much smaller-scale battles, and those behaves quite a bit differently than the 80+ division battles. These ones I easily understood what happened, no worry there

Same for the infrastructure-bombed territories. It's just the Paris battle that has me pretty confused (Along with one early offensive battle of mine, but the stacking penality may be enough for that), if there was no real quality advantage for the German in land units, what happened?
Please note that I am acknowledging you certainly played better than I did during the whole war. I'm just curious about what I did wrong, or what I calculated wrong in that battle, so that I don't repeat the same mistakes next time!
