@JohnE "Shooting the horses legs" is actually how you break a cavalry charge. It's a matter of letting a fair amount of flying pointy sticks intersect with the front line of the charge. The art is in having enough flying pointy sticks landing to compensate for the relatively slim chance of actually hitting a horses' leg in full gallop. And enough time/RoF to try it several times. When it succeeds, the result is rather...dramatic... And not something even the best stuntmen can, or are willing to, recreate.
The english had the men, the skill and the luck at Agincourt. But there are plenty of historical battles where the tactic was used, with varying success.
What happened here is that our MC closed in on the enemy cavalry line quickly, so that the archers couldn't shoot without some serious Friendly Fire.
However... Even if our MC heroically manages to murderise the entire cavalry and infantry solo, the archers are still there. At short range. Ready to snipe or pincushion him. In any form of Real Life™ our MC would soon attain the "posthumous" bit of "hero".