Cyropolis was the largest of seven towns in the region that Alexander the Great targeted for conquest in 329 BC. His goal was the conquest of Sogdiana. Alexander first sent Craterus to Cyropolis, the largest of the Sogdianan towns holding out against Alexander's forces. Craterus' instructions were to "take up a position close to the town, surround it with a ditch and stockade, and then assemble such siege engines as might suit his purpose....". The idea was to keep the inhabitants focused on their own defences and to prevent them from sending assistance out to the other towns.