Why is the Dandao / Miaodao / Long Saber so long?

The Dandao (aka Miaodao or Long-Saber) is one of the longest blades around, and it was designed to fight against Spearmen. Why is the blade so long, and how does it help? Find out in this video. For a more comprehensive report, you may read the measurements that we have taken over here: Download the 400 years old Dandao manual at: