I started a thread on the Great War Forum which came to the conclusion that dive-bombing was indeed used in the WW1, bearing in mind that the technique does not have to involve near-vertical dives. 45 degrees is ample to achieve accuracy and speed is not important for the aiming process (only for evading AAA)
Dive-Bombing in WW1? - Great War Forum
Tieing this in with the Harmon article : it is another example of how the Allies had all the resources of the Germans, and the same or greater quantities, but failed to use them effectively.
We never developed dive-bombing properly. Whether the Battles were more vulnerable than Stuka because they were not dive-bombers or because they were not escorted properly is another matter.
It is well known that Dowding refused to send many Hurricanes to France - which was right in order to defend the UK if France fell, but if we had sent enough we may have prevented France falling - a huge gamble of course.
The French were in logistical chaos - a third of their new Bloch 151 fighters were non-operational due to lack of propellers.
We forgot the expertise gained by the "Last Hundred Days" of WW1, when the British Army successfully used combined air, infantry, artillery and tank units, with highly developed communications, in a mobile war that some say was the most successful British military operation ever. In fact we were virtually using Blitzkrieg tactics by then - this was by no means exclusively a German invention.
The other day I was at a meeting of Cross and Cockade, the WW1 aviation organisation. Colin Ashford, a leading Aviation artist was present. We talked about digging trenches in the Passchendaele mud in 1917, and Colin said that his regiment was digging trenches in the same area in 1940 (so he must be about 87 by now!) and that
as an infantryman he was only taught trench warfare!
One French Tank Battalion with Somua cruiser tanks broke out of the static French lines and successfully used Blitzkrieg tactics to push the Germans back in that area some considerable distance, but then they had to withdraw due to lack of support. The commander was one Charles De Gaulle.