They serve together in the small Spartan defense force.
Dilio is one of the thirteen accepted Spartans who accompany Leonidas to the Hot Gates and fight in the campaign.
They are fellow soldiers in the Spartan unit.
Both Sonio and Dilio are members of Leonidas's Spartan platoon at Thermopylae and participate in the same defense.
Dilio remains opposed to Xerxes after the first battle.
Dilio fights with Leonidas's Spartans against Xerxes's army, survives the battle, and later leads a larger Spartan force against the Persians.
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