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Shah Tahmasp of Persia tried to exploit the inexperience of the young Mughal Emperor Akbar, then an adolescent. He sent an army to lay siege to Kandahar, a vital southern Afghan city held by Shah Muhammad, a governor appointed by the Mughal regent Bairam Khan. With no way to offer military assistance, Akbar was compelled to surrender Kandahar to the Persians. The Persians held the city on and off for almost four decades before the Mughals recovered it.