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The Sacred Band of Thebes was a elite force in the Greek city state of Thebes consisting of 150 male lovers with a total of 300 gay men that defeated the Spartans in the Battle of Leuctra.

In the Battle of Chaeronea the Macedons fought the Thebans and crushed the Sacred Band but the Sacred Band didn't break until every last gay man died.

Basically the reason why the Sacred Band of Thebes was formed was because the Thebans thought that if you combined the genetic strength of men with the hellish power of love then you could get something powerful. So, in a even more basic sense, the Thebans chose gay men in the army because gay men would die to get revenge for their lover so each man you killed you just angered another nearby gay dude who was now going to rip your face off.