After the battle Umar changed his policy towards Sassanid Persian Empire, Yazdegerd III, who unlike his Roman counterpart Heraclius, denied submission to Muslim supremacy in his land, was a constant threat for Caliphate, Umar decided to launch a whole scale invasion of Sassanid Persian Empire to eliminate this threat. After a devastating defeat at Nihawand, last Sassanid emperor Yazdgerd III, a man with iron nerves, was never to be able again to raise more troops to resist the mighty onslaught of Umar, it had now become a war between two rulers, Umar would follow Yazdgerd III to every corner of his empire either will kill him or will capture him, like he did with Hormuzan.