Passage: However, he remained in command of the fleet for the voyage from the Indus to the Persian Gulf, which he recorded in detail (and which was used extensively for Arrian’s Indica). Again, although he was the admiral, in command of the fleet, great seamanship was not required – the naval responsibilities were Onesicritus’. During the voyage, Nearchus was reputedly the first Greek commander to visit Bahrain, which was called Tylos by the Greeks. His visit marked the start of Bahrain's inclusion within the Hellenic world, which culminated in the worship of Zeus (as the Arab sun god, Shams) and Greek being spoken as the language of the upper classes.

Question: What did he command?
fleet