Heavy cavalry charge:How exactly was it done?

[Strategos]

I think you mean the battle of Großgörschen 1813?
Well, i remember that horses do not want to run into a solid line of men, if this would not be true, Wellington would have had a hopeless position at Waterloo when General Neys Cavalry attacked the British squares, or remember Gaugamela, when the Macedonians opened channels through their lines to trap the chariots.
I believe that the ranks of a cavalry unit must break when charging a fresh infantry unit, no matter what period you are looking at.
Kind regards
Strategos