Evening drew on, and Medea went sadly back to her night of anguished vigil in her palace in the city, while Jason prepared himself for his doubtful conflict. At midnight he bathed alone in the sacred river. Then he digged a pit in the plain as Medea had directed him, and offered a lamb by the pit's brink, and kindled a pyre and burned the carcase. Mingled libations he also poured, and then, calling on Hecate, drew back and strode from the place, and looked not once behind him at the awful queen he had invoked, nor the shapes of fear that accompanied her, nor turned at the wild baying of the hounds of hell.
Then he sprinkled his corslet, his helm, and his arms with the drug Medea gave him, and his comrades proved his harness with all their might and main, whose ringing blows fell harmless upon it. Then he sprinkled his own limbs with the magic drug and fared forth invincible.
At dawn, the heroes sailed in the Argo up the river till they came near to the plain of Mars, and there anchored. King Æetes came out from the city in procession to the lists, and all the men of Colchis were gathered on the one hand and the heroes on the other to watch the outcome of this terrible strife.
So Jason set to his task. Bearing with him his helm full of the dragon's teeth he crossed the field, and there saw the brazen yoke lying, and the plow of massive stone. Suddenly, from their lair, the bulls rushed out together and bore down upon him. Jason, setting his feet wide, caught their charge on his shield and withstood the shock. Mightily he seized the horn of one of the monsters, haled with all his strength, and striking its hoof with his foot cast it down on its knees. And, to the amazement of all, he did likewise to its fellow. Then he cast away his shield, and holding them down set the brazen yoke on their necks. All marveled at his superhuman strength. The brow of Æetes was black, but the heroes rejoiced and cheered their leader right lustily.
Then he took with him the helm full of dragon's teeth, and his spear for a goad, and forced those frantic beasts to draw the massive plow across the plain, and sowed his baneful seed as he went. All day long he drove his resisting team across the stony plain; and as the granite plowshare tore its way through the earth he cast the dragon's teeth among the upturned clods.
And at length the evening fell, and he unloosed the yoke, and with smiting and shouting scared the bulls across the plain to their caves. Then he gladly returned to the Argo, plunged his helm into the river, and was about to slake his terrible thirst, when he turned to see the whole earth bristling with armed warriors, row on row of shields and spears and helms. The words of Medea came to his remembrance then, and ere he fell upon them he took up from the earth a great round boulder such as four strong men of to-day scarce could move, and flung it in their midst.
Loudly the Colchians shouted, but speechless fear seized on their king when he saw the flight of that massive crag and beheld the earthborn slaying each other. And among them stood Jason, beautiful as a god, hewing them down with his sword, till not one was left alive.
Then the night fell and Jason slept, for he knew that his task was accomplished. Æetes and his princes went silently back to their city, for the superhuman power of the hero inspired them with nameless fears.
And in the palace Medea was smitten with terror, for she knew that it must come to the ears of the king her father, that by her arts Jason had been helped to victory, and she dreaded his vengeance. She knew not where to turn for aid but to Jason himself; so she veiled herself, and thrusting her secret drugs and poisons into her bosom, she fled in the darkness from her palace. Through the night she hastened, weeping piteously, torn between love and duty to her parents and her passion for the man her spells had helped, till she saw the gleam of the fire where the heroes were feasting on the river bank. And through the noise of their revelry and the ringing of their gay laughter a bitter cry was heard—a woman's cry. And the sons of Phrixus, her nephews, and Jason, her lover, knew her voice, and they hastily thrust out from the bank and rowed to the place where she stood, and Jason leaped to the bank beside her.
Then Medea clung to his knees and besought him to carry her away lest her father's vengeance should fall heavy upon her. Therefore, before them all, he swore to take her to Greece and wed her there.