Benjamin Parker wrote:Well by knight I mean a man with full AOP and chain mail, crossbow, gun, barded horse, lance, side arm,
That seems to be more equipment than any historical man-at-arms would have been carrying... (especially the armor and the crossbow--I've heard of gendarmes and lancers carrying one pistol on the saddle but not of any medieval/Renaissance man-at-arms carrying
both lance and crossbow, especially when he already had a firearm!
and I mean a charge form the front into the arqubuse's although a flank or rear charge works too
By the time the "arquebus" (I take it that you mean the 16th-century matchlock firearm, not the earlier "hook guns") became a major presence on the battlefield, the dominant tactical paradigm was quite Neoclassical--ideally the horsemen would engage the opposing horsemen in front of them, rout those enemies, and then reform for a charge into the flank or rear of the enemy's infantry. So the ideal
was a flanking charge and I doubt any Renaissance commander would have willingly thrown his horsemen into a frontal slugfest into infantry if he had a choice.
Now, the real difficulty with your question is that it seems to be focused on the earlier half of the 16th century, and during this period we don't really see massed firearm formations operating on the battlefield except as a component of a combined pike-and-shot formation. It's going to be quite hard (maybe even impossible) to separate the effect of the fire from that of the pike in countering the cavalry attack; for example, the
Battle of ceresole included numerous direct and bloody clashes between cavalry and pike-and-shot infantry formations, and I don't think I've seen a study that has successfully established how many cavalry casualties were due to firearms and how many were due to cold steel at this battle.