The sentence to the city of Troy

After Apollo and Poseidon angered Zeus they were sent to the city of Troy. They served King Laomedon and he ordered the two to make a wall around the city like armor. he said that he would give them a prize. When they finished the king wouldn't keep his promise (he was… shellfish. Eh? Poseidon -> fish?). Poseidon decided after coming back to power to send a sea monster to punish the corrupt king. Unfortunately for Poseidon, Hercules slaughtered the watery beast.