Han Jian have no hand guards ?
Rarely seen out side private collections and museum display. Han Fencing Jian pre-dated western swords with similar hand guard for over 1000 years.
For the Military Jian, the Han people choose not to put big hand guard because they want to maximized the attacking speed in battle. So this is a deliberate choice, not because the Han people did not know how to make hand guards.
LK Chen practice with the rare Han Fencing Jian
Target drills on hanging empty bottle