For instance, he helped in the Trojan War. In the Trojan war, Poseidon helped Greeks out, but it's also said that he did this on one occasion that he had worked against them as well. According to some sources, the war started with a god who was jealous of a wall that the Greeks had built to protect their ships. The god was worried about the Trojans wall and it would be humiliated by the Greek's wall and how it was more famous than the Trojans wall. So, they decided to try to destroy the Greek's wall. Poseidon, after seeing that this is happening, decided to intervene and encouraged troops to engage in war even though Zeus said not to engage in war. As the war progressed, Poseidon got word that the Trojans killed one of his grandsons, Amphimachus and got so angry he was going to take part in Hera's plan to deceive Zeus. So, when Zeus was asleep, Poseidon had engaged in the war leading the Greeks and as he yelled, it brought the moral of the Greek troops and led them to destroy the Trojans for good. When Zeus woke up, he saw what was happening and ordered all gods on the battlefield to retreat and Poseidon as well thought it might be best to retreat and go back into the sea where he lived (Theoi Project -
For instance, he helped in the Trojan War. In the Trojan war, Poseidon helped Greeks out, but it's also said that he did this on one occasion that he had worked against them as well. According to some sources, the war started with a god who was jealous of a wall that the Greeks had built to protect their ships. The god was worried about the Trojans wall and it would be humiliated by the Greek's wall and how it was more famous than the Trojans wall. So, they decided to try to destroy the Greek's wall. Poseidon, after seeing that this is happening, decided to intervene and encouraged troops to engage in war even though Zeus said not to engage in war. As the war progressed, Poseidon got word that the Trojans killed one of his grandsons, Amphimachus and got so angry he was going to take part in Hera's plan to deceive Zeus. So, when Zeus was asleep, Poseidon had engaged in the war leading the Greeks and as he yelled, it brought the moral of the Greek troops and led them to destroy the Trojans for good. When Zeus woke up, he saw what was happening and ordered all gods on the battlefield to retreat and Poseidon as well thought it might be best to retreat and go back into the sea where he lived (Theoi Project -