When the Athens became overcrowded in the peloponnesian war what happened?

During the Peloponnesian War, as Athens became overcrowded due to an influx of refugees from surrounding areas, the city's infrastructure struggled to cope with the increased population. This led to severe sanitation issues, resulting in the outbreak of a devastating plague in 430 BCE, which killed a significant portion of the population, including the influential leader Pericles. The overcrowding and subsequent plague weakened Athenian morale and military capacity, contributing to their eventual defeat in the war.