The island of Rhodes was a
mercantile republic with a large navy which controlled the entrance to the
Aegean Sea. Rhodes maintained treaties of neutrality with other empires to protect trade. However, they had a close relationship with
Ptolemy I, and Demetrius was worried Rhodes would supply him with ships. Demetrius also saw the possibility of Rhodes being used as a base of operations. The decision to lay
siege to Rhodes was influenced by these fears but it was also effectively a piratical enterprise by Demetrius. Much of the Greek world, regardless of whether they were allies of Demetrius or not, apparently also viewed the siege as a
pirate attack and sympathized with the Rhodians, and this attitude existed even in Macedonia. Demetrius brought an army of roughly 40,000 men, whilst the Rhodians had a force of 6,000 citizens, 1000
metics and aliens, and an unspecified number of slaves, whom the Rhodians promised to buy and free from their masters if they proved themselves in battle. == Siege ==