The significance of the Battle of Marathon, fought in 490 BC, lies in its role in the Greek-Persian Wars. The battle showcased the strength and determination of the Athenian army against the vastly larger forces of Persia. The Greek victory not only prevented the invasion of Athens but also provided a powerful symbol of democratic resilience and civic duty. This triumph is often credited with boosting Greek morale and unity, paving the way for future successes in the struggle against Persian dominance and ultimately influencing Western civilization's development.