Yazdegerd was unable to raise another army and became a hunted fugitive. In 642 Umar sent the army to conquer the remainder of the Persian Empire. The entirety of present-day Iran was conquered, followed by Greater Khorasan (which included the modern Iranian Khorasan province and modern Afghanistan), Transoxania, Balochistan and Makran (part of modern-day Pakistan), Azerbaijan, Dagestan (Russia), Armenia and Georgia; these regions were later re-conquered during Uthman's reign with further expansion into the regions which were not conquered during Umar's reign; hence, the Rashidun Caliphate's frontiers in the east extended to the lower river Indus and north to the Oxus River.