Whom does Alexander the Great attack in this scene from the "Alexander Mosaic" found at the House of Faun in Pompeii?

Porus, Hindu Emperor
104
Bessus, the Satrap of Bactria
82
Darius III of Persia
1001
Memnon of Rhodes
117
The Alexander Mosaic, dating from circa 100 BC, is a Roman floor mosaic originally from the House of the Faun in Pompeii. It depicts a battle between the armies of Alexander the Great and Darius III of Persia. The original is preserved in the Naples National Archaeological Museum. The mosaic is believed to be a copy of an early 3rd-century BC Hellenistic painting.
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