stylistic:style_transfer, information:extraction
Bactrian campaign and Indian expedition

The year 209 BC saw Antiochus in Bactria, where the Greco-Bactrian king Euthydemus I had supplanted the original rebel. Antiochus again met with success. Euthydemus was defeated by Antiochus at the Battle of the Arius but after sustaining a famous siege in his capital Bactra (Balkh), he obtained an honourable peace by which Antiochus promised Euthydemus's son Demetrius the hand of Laodice, his daughter, and allowed Euthydemus himself to keep his royal title.

Antiochus next, following in the steps of Alexander, crossed into the Kabul valley, reaching the realm of Indian king Sophagasenus and returned west by way of Seistan and Kerman (206/5). According to Polybius:

He crossed the Caucasus and descended into India, renewed his friendship with Sophagasenus, king of the Indians, and received more elephants, raising their number to a total of one hundred and fifty, and provisioned his army once more on the spot. He himself broke camp with his troops, leaving behind Androsthenes of Cyzicus to bring back the treasure which this king (Sophagasenus) had agreed to give him.