Bk VI:204-266 The gods' vengeance: Niobe's sons are killed.
The goddess was deeply angered, and on the summit of Mount Cynthus she spoke to her twin children. "See, it will be doubted whether I, your mother, proud to have borne you, and giving way to no goddess, except Juno, am a goddess, and worship will be prevented at my altars through all the ages, unless you help me, my children. Nor is this my only grief. This daughter of Tantalus has added insult to injury, and has dared to put her children above you, and has called me childless, may that recoil on her own head, and has shown she has her father's tongue for wickedness." Latona would have added her entreaties to what she had related, but Phoebus cried "Enough! Long complaint delays her punishment!" Phoebe said the same, and falling swiftly through the air, concealed by clouds, they reached the house of Cadmus.
There was a broad, open plain near the walls, flattened by the constant passage of horses, where many wheels and hard hooves had levelled the turf beneath them. There, a number of Amphion's seven sons mounted on their strong horses, and sitting firmly on their backs, bright with Tyrian purple, guided them using reins heavy with gold. While Ismenus, one of these, who had been the first of his mother's burdens, was wheeling his horse's path around in an unerring circle, and hauling at the foaming bit, he cried out, "Oh, I am wounded!" and revealed an arrow fixed in his chest, and loosing the reins from his dying hands, slipped gradually, sideways, over his mount's right shoulder.
Next Sipylus, hearing the sound of a quiver in the empty air, let out the reins, just as a shipmaster sensing a storm runs for it when he sees the cloud, and claps on all sail, so that not even the slightest breeze is lost. Still giving full rein, he was overtaken, by the arrow none can avoid, and the shaft stuck quivering in his neck, and the naked tip protruded from his throat. Leaning forward, as he was, he rolled down over the mane and the galloping hooves, and stained the ground with warm blood.
Unlucky Phaedimus, and Tantalus, who carried his grandfather's name, at the end of the usual task imposed on them, had joined the exercise of the young men, and were gleaming with oil in the wrestling match. And now they were fully engaged, in a tight hold, chest to chest, when an arrow, loosed from the taut bow, pierced them both, as they were. They groaned as one, and fell as one, their limbs contorted with pain. As they lay there, they cast a last dying look, as one, and, as one, gave up the ghost. Alphenor saw them die, and striking at his breast in anguish, he ran to them to lift their cold bodies in his embrace. In this filial service he also fell, for Delian Apollo tore at his innermost parts with deadly steel. As the shaft was removed, a section of his lung was drawn with it, caught on the barbs, and with his life's blood his spirit rushed out into the air.
But it was not a simple wound that longhaired Damasicthon suffered. He was hit where the shin begins, and where the sinews of the knee leave a soft place between. While he was trying to pull out the fatal shaft with his hand, another arrow was driven into his throat as far as the feathers. The rush of blood expelled it, and gushing out, spurted high in the air, in a long jet. The last son, Ilioneus, stretched out his arms in vain entreaty. "O you company of all the gods, spare me!" he cried, unaware that he need not ask them all. The archer god Apollo was moved, though already the dart could not be recalled: yet only a slight wound killed the boy, the arrow not striking deeply in his heart.