Roman History - Lone Horseman Charge?

[Antonivs Silvicola]

Caesar's charge in Spain was at Munda. Supposedly his shield was riddled with pila and he survived(sounds like propaganda to me) thus his forces were encouraged and won the day. Also, don't forget about the story of Horatius from Romes early history whom, with two other men held off an entire army while the romans destroyed a bridge across the Tiber. The other two men crossed back just as the bridge collapsed leaving Horatius alone. He then managed to swim the Tiber in full armour and the enemy turned back. PRobably more myth than truth but meh. You can read the entire poem; Horatius by Thomas Babington Macaulay.

[antisocialmunky]

That's pretty Chuck Norris right there.

[Owen Glyndwr]

Are you thinking possibly of Horatius?

Figure from early Republican army: Etruscan army marching on Rome, Horatio marches out alone and stands on the bridge leading over the Tiber, where he single-handedly holds off the entire Etruscan invasion force while his friends cut the bridge down. Some stories have him drown, others have him swim over to the other side.

Wikipedia's page on him: http://en.wikipedia.org/wiki/Horatius_Cocles

Only problem: he didn't ride a horse, so I dunno if you might be getting your stories mixed up, but that's the one that first popped into my mind when you mentioned single-handedly.