What were the outcomes of king leonidas's actions in the battle of thermopylae?

The plan to hold the pass to provoke a sea battle in the nearby strait to destroy the Persian navy failed as the Greeks lost the sea battle.

As this failed, the Greek holding force dispersed back to their cities.

Leonidas and his Spartan 2,400 heavy and light infantry continued to hold the pass to let them escape. They were slaughtered.