Really small hex and counter wargame, by Lou Coatney.
Corps to army Level, with British 1st Armoured Division thrown in. Succinct air rules. Incentive for British evacuation, should the French collapse. }:-)
From the Designer's Notes:
I should mention right here that I used the map and infantry strengths of my previous game, France 1914, as a basis for Blitzkrieg! The Attack on the West, 1940. The difference in this 1940 game is the advent of massed armor groups and airpower, and the dramatically different pace of events demonstrates the difference in outcome of the German offensives in the respective world wars. The teaching/learning value of playing the two games and being able to directly contrast the two campaigns - the simpler, introductory France 1914 first, of course - is considerable.