Final answer:
The Battle of Thermopylae occurred in a small pass with mountains on one side and the sea on the other. It had five stages: deployment and initial clashes, the Greeks holding the pass, Persian tactical changes and betrayal, the final stand of the Greeks, and the Persian victory and aftermath.
Step-by-step explanation:
The event that occurred in a small pass with mountains on one side and the sea on the other is the Battle of Thermopylae. This ancient battle between the Greeks, led by King Leonidas I of Sparta, and the Persians took place in 480 BC during the Persian Wars. The battle had five stages:
- Deployment and initial clashes
- The Greeks hold the pass
- Persian tactical changes and betrayal
- Final stand of the Greeks
- Persian victory and aftermath
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