Of own experience by training, if you learn and train medieval swordfighting the first blows to learn are all to the head. Thats the most important part. From up to down.
You can have small wounds on arms, legs, also body but if only one 'knock' on the head you are at least for some important seconds not very fit for all actions.
Ok, for internet there exist not to much good videos, but one shows at least the moves for german longsword using. Its clear why those blows are not effectively blown, because all actions would result in the death of the opponent.
You see there the action for first a deadly blow, then the parrying and sometimes the third stage of fight the reaction of the parrying. Its recreated after medieval german swordfighting schools and the teaching books still exist. Most is able to recreate for folks have advantage now decades ago beginning with eastern asiatic fighting schools. Momentary you are able to train those styles by today experienced trainers. The interesting aspect for those here presented are really fighting styles for finally killing your opponent, not for wounding only (like for some duels) for really end-results.
Looks perhaps for some folks unspectacular, sure.
Those folks also fight for stagefightstyle or showfight, here they present 'fencing' for surely sadly deadly results if acted in the right way.
Here a link for their mainsite:
http://www.gladiatores.de/Movies.html
and also one directly to youtube but there are also many scrap for fighting also vieawable, its really difficult to find the 'real' stuff.
http://www.youtube.com/watch?v=HC5FIyfI8TA
but finally you see, many blows want to be placed on the head (those are really the first ones you learn, a blow from up to down) and also wanted to parry, also an important aspect the parrying is normally acted in a way with that parrymove the first defender can react at once to a counterattack.
you read often the word 'kopff' its the head and 'maul' is mouth. In the old german words is explained (also in the books) what you need to do and where you must place the blow.