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Here is my brigade of Dutch horse- one that was in the second line at Fontenoy.
By 1745 the cavalry was not exactly the "cutting edge" of the Dutch army- more like one of those blunt plastic spoons! It was the Dutch cavalry that let the infantry down at Lauffeldt by refusing to charge the French when it might have made all the world of difference.
While I would imagine that Holland with all it's dikes and canals would not have made for a very good cavalry tradition, it has to be said that the Prussians also started with wretched horse regiments- one need only look at Mollwitz in 1741.
And yet with proper training and care, Frederick the Great was able to turn the Prussian cavalry into the best in Europe. Who knows what the Dutch horse may have achieved given similar treatment and the leadership of such men as von Seydlitz?
I know of no source of information available for the Dutch cavalry standards of this time. The flags given for the regiments above are purely arbitrary- I got them from the "Warflag" site, and are Dutch standards for the earlier War of the Spanish Succession.
At least the green flag for the Hessen-Homburg regiment is from another regiment named Homburg!