Battle of Thermopylae

According to Herodotus, of the 300 Spartans who fought at Thermopylae, two did not take part in the battle due to violent eye pain.

An excerpt from the article 31 facts about Battle of Thermopylae

After returning to Sparta, one of them hanged himself (“effeminate, this he suffered: none of the Spartans lit a fire for him or spoke to him, and for disgrace, he was called a coward”), and the other, wanting to regain his good name, in 379 BC participated in the battle of Plataea, in which he died showing his bravery.