The Gerron is a shield that was used by the Persian Immortals.
The Gerron was a figure eight shaped shield made of whicker and covered with leather.
In combat the soldier held the shield in between the crescent-shaped concave indications of the gerron. Unfortunatly for the Persion troops the light construction of the shield did not stop heavy weapons like spears from puncturing the relatively flimsy whicker (similar to the Kube). Although it continued to be used but later on during the empire's reign, the Gerron was often discarded in favor of the hoplon-style shield.