Why Some Swords Had Only One Edge

Most swords we are used to seeing have two edges. Medieval arming swords, longswords, Viking swords, Roman swords: they usually have a blade sharpened on both sides. But not all swords were made this way. Some swords had only one cutting edge on one side of the blade. And the question is, why do this? Why only have one edge on a sword? Or maybe the better question is: why have two edges in the first place? What does the second edge actually do? 0:00 Introduction to sword edges 0:42 Cultural and historical usage 3:48 Durability and manufacturing 7:03 Combat effectiveness 10:31 Thrusting capabilities 13:01 Versatility and utility 15:35 Design flexibility 17:34 Conclusion and summary