And now, from somewhere in the bowels of the earth, from the smoky stronghold where they slept, the pair of bulls appeared, breathing flames of fire.… - Apollonius of Rhodes

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And now, from somewhere in the bowels of the earth, from the smoky stronghold where they slept, the pair of bulls appeared, breathing flames of fire. The Argonauts were terrified at the sight. But Jason planting his feet apart stood to receive them... He held his shield in front of him, and the two bulls, bellowing loudly, charged and butted it with their strong horns...