The Iliad by Homer Book 5 Page 10

If, then, any other god comes here and offers you battle, do not fight him; but should Jove’s daughter Venus come, strike her with your spear and wound her.”

When she had said this Minerva went away, and the son of Tydeus again took his place among the foremost fighters, three times more fierce even than he had been before. He was like a lion that some mountain shepherd has wounded, but not killed, as he is springing over the wall of a sheep-yard to attack the sheep. The shepherd has roused the brute to fury but cannot defend his flock, so he takes shelter under cover of the buildings, while the sheep, panic-stricken on being deserted, are smothered in heaps one on top of the other, and the angry lion leaps out over the sheep-yard wall. Even thus did Diomed go furiously about among the Trojans.