Arrian cites Ptolemy as saying Cyropolis surrendered from the start, and Arrian also states that according to Aristobulus the place was stormed and everyone was massacred.
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Alexander first sent Craterus to Cyropolis, the largest of the towns holding Sogdiana against Alexander's forces.
In reality, he had just renamed (and possibly, expanded) the city of Cyropolis founded by king Cyrus the Great of Persia, more than two centuries earlier.