With their primary ally defeated and too militarily weak to confront the Antigonids alone, the Athenians could do little but wait behind their walls and hope the Ptolemies could send aid before the inevitable siege. Unfortunately for them, however, Philadelphus would not be ready to mount a major expedition until after Athens had already been starved into surrender in either 262 BC or 261 BC. In the end it did not matter since when the Egyptians finally tried to send aid and reinforcements to Athens, their fleet was defeated off Cos (probably in 261 BC).