Swordfighting is more about leverage than force, especially so for long swords. So, no, you do not want to put all your force behind it. That puts you off balance and the gain in impact is relatively small. Besides, even light contact - just letting a sword rest on it with no pressure applied - can cut to the bone by just drawing the blade along. These things are sharper, lighter and faster than most media makes you believe for show effect.For me fencing does not represent a real battle in any way.Even the battles in medieval revival contests like Battle of the Nations are far from realistic.Why?
Because in a real life battle you want to kill the other person.Not pound him with a blunt sword or pinch him with a blunt rapier for points.You want to put your full force behind blows to smash his head or slash his intestines.
The actually relevant difference between fencing and combat lies in a) the number of participants and b) the threat to your life and its consequences for your approach to the fight. In fencing, while certainly you don't want it, you might risk taking a hit. In combat, that likely marks your end and your upmost goal is to avoid that.


