Han dynasty due to its sturdiness, superiority as a chopping weapon, and relative ease of use 

it was generally said that it takes a week to attain competence with a dao/saber,

a month to attain competence with a qiang/spear,

and a year to attain competence with a jian/straight sword.

Soon after dao began to be issued to infantry, beginning the replacement of the jian as a standard-issue weapon.

 Late Han dynasty dao had round grips and ring-shaped pommels, and ranged between 85 and 114 centimeters in length.

These weapons were used alongside rectangular shields.