How did Poseidon punish Odysseus?

Despite the gods settling that Odysseus should go back to Ithaca, Poseidon still refused to pity him and continued to attempt to harm him. He even caused a great storm that completely broke Odysseus, leaving him swollen and exhausted. After this, Poseidon sent a sea monster to attack Odysseus and his men, but Odysseus was able to outwit the monster and escape to safety. Poseidon was also angered when Odysseus and his men ate the cattle of the sun-god, and he punished them by striking the ship with his thunderbolts, killing all of Odysseus' men. Despite all of this, Odysseus was able to survive.

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But Neptune did not forget the threats with which he had already threatened Ulysses, so he took counsel with Jove. “Father Jove,” said he, “I shall no longer be held in any sort of respect among you gods, if mortals like the Phaeacians, who are my own flesh and blood, show such small regard for me. I said I would let Ulysses get home when he had suffered sufficiently. I did not say that he should never get home at all, for I knew you had already nodded your head about it, and promised that he should do so; but now they have brought him in a ship fast asleep and have landed him in Ithaca after loading him with more magnificent presents of bronze, gold, and raiment than he would ever have brought back from Troy, if he had had his share of the spoil and got home without misadventure.”

“Thus did he pray, and Neptune heard his prayer. Then he picked up a rock much larger than the first, swung it aloft and hurled it with prodigious force. It fell just short of the ship, but was within a little of hitting the end of the rudder. The sea quaked as the rock fell into it, and the wash of the wave it raised drove us onwards on our way towards the shore of the island. “When at last we got to the island where we had left the rest of our ships, we found our comrades lamenting us, and anxiously awaiting our return. We ran our vessel upon the sands and got out of her on to the sea shore; we also landed the Cyclops’ sheep, and divided them equitably amongst us so that none might have reason to complain. As for the ram, my companions agreed that I should have it as an extra share; so I sacrificed it on the sea shore, and burned its thigh bones to Jove, who is the lord of all. But he heeded not my sacrifice, and only thought how he might destroy both my ships and my comrades.