Indeed Liddell Hart
As for your comments on artillery v tactical air power. Germany had very good artillery but until the advent of their tracked 'Self propelling guns' like the Hummel it couldn't jeep pace with the armour.
France was tied to a system of WW1 style Siege artillery, big and cumbersome to move but it was seen as the 'heart' of their forces and their advance was tide to it. Between the wars GB realised that artillery needed to be more mobile and this led to the development of the 25 pdr and it's 'quad' 4 wheel drive tracotrs, the best of which were the Chevrolet versions built in Canada. Alongside these like the Germans self propelling guns were produced in large numbers after experience in the desert showed that towed guns no matter how good the tractors would always hold up an advance. This led to the 25pdr Bishop, 105mm Priest (produced in the USA and used in the Western Desert by the Commonwealth forces and ultimately the 25pdr armed Sexton designed in Canada on the 'Ram' tank chassis which was in service well in to the 1960s. Losing a lot of the artillery at Dunkirk was, as it turns out a good thing because the new 4.5 5.5 and 7.2 inch guns that replaced all the stuff that was lost were very good weaponsand the 5.5 remained in service into the 70s.
Dad has 1940 wartime austerity edition of "The British Way in Warfare"
Interesting read