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In its time, the Rashidun army was a powerful and very effective force. The size of the Rashidun army was initially 13,000 men in 632, but as the Caliphate expanded, the army gradually grew to 100,000 men by 657. The three most successful generals of the Rashidun army were Khalid ibn al-Walid, who conquered Persian Mesopotamia and Abu Ubaidah ibn al-Jarrah who conquered Roman Syria, and 'Amr ibn al-'As, who conquered Roman Egypt.
632