Final answer:
Zeus did not definitively side with either party in the Trojan War, but he did enforce neutrality by barring gods from directly participating in the conflict later in the story.
Step-by-step explanation:
In the context of the Trojan War, Zeus, the king of gods and the ruler of the sky, did not take a definitive side. In Greek mythology, the Olympian gods, including Zeus, were known to be capricious and frequently changed their involvement with mortals, often due to personal vendettas or whims.
However, Zeus did enforce a rule of not allowing other gods to participate directly in the battle later on, which can be seen as an attempt to maintain a level of neutrality. The gods typically involved themselves based on personal grudges or alliances, such as Athena siding against the Trojans due to the judgment of Paris.