No it's Persepolis. Can you imagine Darius carrying all these mountains of gold around? In Issus he just captured his personal buggage.Actually, most of the wealth would come from takign the Persian treasury after Issus, I think.
There was a series of small but ingenious battles at the Persian straits when Alexander with a small mobile force tried to force his way to Persepolis in order to be the first that gets the immense treasure it held. It's too bad that it's not famour like his major battles since it really shows his strategic abilities.
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