Select OneDrive, and do one of the following: 1  To save documents, select File storage, and under Save documents to OneDrive by default, move the slider to On.  To save photos, select Camera roll, and choose Upload photos at good quality or, for higher resolution copies, choose Upload photos at best quality.
Thermopylae (lit. hot gates) was a pass the Greeks tried to defend in battle against the Persian forces led by Xerxes, in 480 B.C. The Greeks (Spartans and allies) knew they were outnumbered and hadn't a prayer, so it was no surprise that the Persians won the Battle of Thermopylae.
It wasn't just Greeks against Persians, nor were all the Greeks on the Greek side. Conflict began before the usual start date of the Persian Wars; however, for practical purposes, the term Greco-Persian Wars covers the invasions of Greece by two Achaemenid Persian kings from about 492 B.C. to 449/448 B.C.