Category: Disambiguation Combatants Greek-city states Persian Empire Commanders Leonidas I † Xerxes I the Great of Persia Strength 300 Spartans 700 Thespians 6,000 other Greek allies2 60,000-2,000,000 (estimates vary)1 Casualties 300 Spartans and 700 Thespians; 1,400 Greek allies in total. ... The 353 BC Battle of Thermopylae occurred after the defeat at the Battle of Crocus Field left Phocis with a greatly reduced army. ... The Battle of Thermopylae in 279 BC involved Brennus, the Gaul, leader of the army of Gauls, which invaded Macedonia and northern Greece and turned the Greek defense at the pass of Thermopylae, and sacked Delphi. ... Combatants Roman Republic Seleucid Empire Commanders Lucius Cornelius Scipio Asiaticus Antiochus III the Great Strength 22,000 10,500 and some allies Casualties 200 10,000 killed and prisoners The Battle of Thermopylae was fought in 480 BC between a Spartan and Persian army led by consul Manius Acilius Glabrio... The Battle of Thermopylae in 267 was the unsuccessful defense of the pass by local forces during the great invasion of the Balkans by the Heruli. ... German soldiers at Thermopylae after Allied retreat The Battle of Thermopylae during World War II occurred in 1941 following the retreat from the Olympus and Servia passes. ... Image File history File links Disambig_gray. ...