How did the military strengths of Athens and Sparta shape the Peloponnesian War?

The military strengths of Athens and Sparta were fundamental to the course and outcome of the Peloponnesian War. As noted by the historian Thucydides, the conflict was defined by the clash between two distinct state characters and their respective military capabilities.12

Military Strengths

• Athens: Possessed the superior navy and significant financial resources, bolstered by the Delian League. Its strategy, championed by Pericles, relied on sea power to harass enemy coasts while remaining protected behind the city's fortified walls.324
• Sparta: Held the advantage on land as the leader of the Peloponnesian League. Their military approach was generally more cautious and conservative, focused on dismantling the Athenian empire to liberate Greece.24

Strategic Impact

The war was a prolonged struggle between Athenian naval innovation and Spartan land-based stability. While Athens successfully withstood repeated land invasions by retreating behind its walls, the strategy was strained by the high costs of siege warfare and the plague. The conflict eventually turned when Sparta, aided by Persian support, developed the naval capacity to destroy the Athenian fleet at Aegospotami in 405 BCE, leading to the final capitulation of Athens.24