More than 300 20mm CA 39 Oerlikon were present in France at the beginning of the war in more than 30 divisions, mostly infantry, as replacement of the 8mm Hotchkiss MMG's and as a way to ensure some AA protection while the heavier 25mm CA Hotchkiss weren't arriving in numbers.
As most of the pieces in this post these ones are scratch built efforts. More on that a bit further ahead.
The 60mm Brandt mortars are also scratch built in Evergreen with Hat artillery men and Caesar with rifles from EWM.
Next: The dismounted French cavalry for 1940 or more Blitzkrieg Germans.