For 10 points, name this 490 BCE battle of the Greco-Persian Wars.
The losing side of this battle lost nearly a third of its men after its commander, Datis, ordered a retreat. Hippias commanded one side's forces during this battle after being expelled from Athens by Cleomenes I. Callimachus was killed during this battle, but his men saved (*) Miltiades' Athenian forces after their center line buckled. The marshlands around the site of this battle prevented one side from fielding its cavalry, but they still utilized their 10,000 Immortals. Legend has it that Pheidippides ran 26.2 miles from the site of this battle back to Athens. For 10 points, name this 490 BCE battle of the Greco-Persian Wars.
The losing side of this battle lost nearly a third of its men after its commander, Datis, ordered a retreat.
Battle of Marathon