The Battle of Sallasil(Dhat al-Salasil) or the Battle of Chains was the first battle fought between the Rashidun Caliphate and the Sassanid Persian Empire. The battle was fought in Kuwait soon after the Ridda Wars were over and Arabia was united under the authority of Caliph Abu Bakr. It was also the first battle of the Rashidun Caliphate in which the Muslim army sought to extend its frontiers.