In 636 AD, the Battle of Chains between the Sassanid Empire and Rashidun Caliphate was fought in Kuwait. At the time, Kuwait was under the control of the Sassanid Empire. The Battle of Chains was the first battle of the Rashidun Caliphate in which the Muslim army sought to extend its frontiers.As a result of Rashidun victory in 636 AD, the bay of Kuwait was home to the city of Kazma (also known as “Kadhima” or “Kāzimah”) in the early Islamic era.