And give me your own fine armor to buckle on my back,
so the Trojans might take me for you, Achilles, yes,
hold off from attack, and Achaea’s fighting sons
get second wind, exhausted as they are…
Breathing room in war is all too brief.
We’re fresh, unbroken. The enemy’s battle-weary –
we could roll those broken Trojans back to Troy,
clear of the ships and shelters!

– Homer

The Iliad, Book 16, lines 46-53. Patroclus asks Achilles to give him his armor to wear in battle. He hopes to demoralize the Trojans by getting them to think that Achilles had returned to the fight.