Conquest of Hamadan
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Was the conquest of Hamadan by the Rashidun Caliphate.
Chronology
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January 643: Within four years Yazdgerd III felt powerful enough to challenge the Muslims again for control of Mesopotamia. Accordingly, he recruited 100,000 hardened veterans and young volunteers from all parts of Persia, under the command of Mardan Shah, which marched to Nahavand for the last titanic struggle with the Caliphate. Although Umar had expressed a desire for Mesopotamia to be his easternmost frontier, the concentration of the Persian army at Nahavand forced him to act. The Muslim army defeated the Persians at the Battle of Nahavand in December 642.
April 643: The Muslims, led by the Rashidun Caliphate, captured the district of Hamadan in 643. The conquest was relatively easy as they faced minimal resistance from the local inhabitants.