When in the Battle of Cercy did any knights charge a full gallop into organised infantry? From what I've read the charges repeatedly failed because most had their horses shot out from under them and the ones remaining couldn't penetrate the english lines. In the Napoleonic wars the whole concept of infantry squares worked on the principle that horses won't charge into them.
I'm not saying that cavalry couldn't attack a dense mass of troops, just that they wouldn't run at full speed into it.
This doesn't mean it was couched, it was used in a 2 handed underarm fashion. Couching is a one handed technique invented (or at least first attested to) during the medieval period.Also, the Kontos is a lance, and it was definitely used underarm (and quite possible couched), as using to unwieldy a weapon overarm is just plain impractical and counterintuitive.
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