Battle of Mantinea Part of the Peloponnesian War Date 418 BC Location Mantinea Result Spartan victory Belligerents Sparta, Arcadian allies of Sparta, Tegea Argos, Athens, Mantinea, Arcadian allies of Argos Commanders and leaders Agis II Laches †, Nicostratus † Strength About 9,000 (3,500 Spartans, 600 Sciritae, 2,000 helots (Neodamodes), 3,000 Tegean allies and cavalry) About 8,000 (3,000 Argives, 1,000 Athenian heavy infantry, 2,000 Mantineans, 1,000 mercenary Arcadians, 1,000 Cleonaeans, Orneans, Aeginetans and other allied infantry and cavalry) Casualties and losses About 300 Spartans with insignificant other allied casualties About 1,100 (700 Argives, 200 Mantineans, 200 Athenians and Aeginetans)