Helen
No, Ares/Mars was on the Trojan side.
Helen wasn't on a side she was the one they were fighting over. So she was on both sides i guess. I don't know: read the Trojan War.
The Greek won the Trojan war
Aphrodite had given Helen to Paris, and thus was committed to their union. Aphrodite fought on the Trojan side. Aeneas was her surviving Trojan son.
The Trojan War was initiated by Agamemnon, the king of Mycenae and the Greek leader, in response to the abduction of his brother's wife, Helen, by the Trojan prince Paris. Agamemnon gathered a coalition of Greek forces to besiege the city of Troy and recover Helen.
Aphrodite had given Helen to Paris, and thus was committed to their union. Aphrodite fought on the Trojan side.
The Greek Side
No. The Trojan horse wasa supposedly built in the Greek times, in a war over Helen Of Troy.
The King of Sparta was Helen's husband, Menelaus.
Troy. She gave Paris Helen's love.
Paris who is Priam's son, steals Helen from the Achaian side and that starts the war. Though it is debatable whether Helen leaves with free will or not, the action of taking her is a significant breach in the Greek Value of hospitality which gives the Achaians ample reason to attack.