There was no slaughter - after three days blocking the Persian advance at the pass at Thermopylai, the Greek force was withdrawn.
The Spartan and Thespian contingents stayed behind to cover the withdrawal and died in the process.
This was a noble sacrifice by the two contingents, but was not specifically a reflection of Greek values - the Persians also showed great courage in the course of the battle.
Courage in battle (and cowardice) are universal traits.
The Spartan and Thespian contingents at the pass at Thermopylai, where they stayed behind to let their allies escape, demonstrated a noble self-sacrifice for others.
Whether this applied to all Greek values, then and now, is a matter of doubt.
No, it was a holding operation, and when its purpose was comleted, the Greek coalition force was withdrawn.
A dozen Greek city-states and the Persian expeditionary force.
It was fought to protect the Spartan and Greek homeland from the invading Persian Empire.
The Persians defeated the Greek, with each side losing a few thousand casualties.
The Persian army versus contingents from southern Greek cities.
The Persians defeated the Greek forces..
King Leonidas of Sparta.
In 480 BCE.
No, they defeated the Greek fleet in the nearby strait of Artemesion and broke through the Greek blocking force at Thermopylae, capturing northern Greece and going on to take Athens.
The Phoenicians were not anywhere near the Thermopylae Pass, so they could not betray the Greek force there.
Thermopylae , Greece
King Leonidas
No, it was a holding operation, and when its purpose was comleted, the Greek coalition force was withdrawn.
The battle of Salamis, the battle of Thermopylae and the battle of Marathon is the famous battle in Greek.
The slowing of the Persian advance at Thermopylae by a force from Greek cities, including Sparta, was to force a sea battle ,but the Greek lost at sea, and the delaying force at Thermopylae was withdrawn. The Greeks won their sea battle at Salamis later on, so Thermopylae had no effect on the outcome of the war. It did, however, become a symbol of staunch resistance.
A coalition of Greek cities led by Sparta.
In fact they crushed the Greek delaying force at Thermopylae an also defeated the Greek navis in the nearby Strait of Artemesion. After both these victories, they moved into southern Greece and occupied Athens.