No one alive today has any personal experience fighting with actual medieval swords or weapons using the methods of combat of that era. No school of that fighting style has survived. There is much we do not know, but the survival of instructional texts and guides have provided much useful information. Here are two excellent sources:
Grzegorz Zabinski, Bartlomiej Walczak
Also, enjoy this pictures from a book on sword fighting c. 1500, State Library of Berlin
