Answer:
iron weapons
Step-by-step explanation:
During the Qin dynasty, the iron weapon became widespread in their military and this had an impact on their military strength.
The iron industry was in high use during this dynasty, and many metal products were generally used (tools, weapons, dishes, etc.)
Archeologists found various iron weapons from this time, such as swords, spears, saggers, machete, as well as various shooting weapons.