Who fought in the thermopylae battle?

Spartans (Greek Warriors) and Persians

Explanation:

The Battle of Thermopylae was fought between an alliance of Greek city-states, led by King Leonidas I of Sparta, and the Achaemenid Empire of Xerxes I. It was fought over the course of three days, during the second Persian invasion of Greece.

after defeating german forces in north africa allied leaders turned their attention to "italy," since this was the location that made the most geographic sense before invading northern europe via france.