This is kind of silly. For some reason (RPGs, perhaps?) people have the idea that arrows and melee weapons "accumulate" damage until you're killed. It's simply not true. One solid blow from a lance or a mace and you are out of action just as surely as if you'd been shot. Not long ago they unearthed a mass grave of the defeated German army from the battle of Grunwald (1410). They discovered 60-70% of the skeletons had one or both legs chopped off. (Many of the opposing Polish & Lithuanian infantry were armed with axes.) You can talk all you want about bullets being lethal, but if your leg gets hacked off, the fight's over as far as you're concerned. The same goes if you're hit somewhere by a crossbow bolt.
Of course in RTS games we pretend that everyone fights to the death, but in reality most wounded men are just as much out of the fight as one killed.
For that matter, an 18th century musket ball hitting you in the leg or arm puts you out of the fight too. A Brown Bess musket fired a spherical lead pellet that was an inch (2.5 cm) in diameter! That's one heck of a big hole! You don't shrug it off and keep fighting, even if the wound is "only" in your leg.
One final note - during Napoleonic times, the average "hit rate" for muskets was about one hit per 250-400 shots. The best "hit rate" ever recorded was at the battle of Malplaquet, when one Irish regiment got 1 hit out of 15 shots. Compare these "slow, inaccurate muskets" to modern weapons which typically have hit rates of 1 per 5,000-20,000 shots! The old-timers actually got proportionally MORE hits than modern combat!