Premise: Athens became so attached to this source of easy money that dissent soon grew among the member cities, and Sparta led the confederacy from Athens after the Peloponnesian War (413  404 b.c. ). The Persians, sensing weakness in the ranks, launched another offensive, resulting in the Ae?Χean coast cities coming under Persian control in 387 b.c.

Hypothesis: The Persians struck on an opportunity and won themselves coastal cities.
Relation: entailment