Diomed receives valour from Minerva; fire flares from his shield and helmet as he enters the thickest fighting.
See evidence text
“Then Pallas Minerva put valour into the heart of Diomed, son of Tydeus, that he might excel all the other Argives, and cover himself with glory. She made a stream of fire flare from his shield and helmet like the star that shines most brilliantly in summer after its bath in the waters of Oceanus—even such a fire did she kindle upon his head and shoulders as she bade him speed into the thickest hurlyburly of the fight.”