Trojan War Timeline (Info from https://www.thoughtco.com/sequence-major-events-in-trojan-war-112868)

The Arrows of Hercules

875 BCE

After the death of Achilles, Calchas uttered yet another prophecy. He told the Achaeans they needed the bow and arrows of Hercules (Herakles) to defeat the Trojans and end the war. Philoctetes, who had been left wounded on the island of Lemnos, had said bow and poisoned arrows. So an embassy was sent to bring Philoctetes to the battlefront. Before he joined the Greek battle line, one of the sons of Asclepius healed him. Philoctetes then shot one of Hercules' arrows at Paris.

Aphrodite Continues to Help Paris

870 BCE

What had Paris been up to all this time? Besides his dalliance with Helen of Troy and slaying of Achilles, Paris had shot and killed a number of Achaeans. He had even fought one-on-one with Menelaus. When Paris was in danger of being killed, his divine protector, Aphrodite, broke the strap of the helmet, which Menelaus was clutching. Aphrodite then shrouded Paris in a mist so that he could escape back to Helen of Troy.

The Next Greatest Hero

863 BCE

The Achaeans and Trojans valued the armor of fallen soldiers. They triumphed in capturing the helmets, weapons, and armor of the enemy, but also prized that of their own dead. Odysseus won. Ajax, who thought the armor should have been his, went mad with rage, tried to kill his fellow countrymen, and killed himself with the sword which he had received from his belt-exchange with Hector.

The Achilles Heel

862 BCE

Soon after, Achilles was killed, wounded in the one spot where legend tells us he was not immortal--his heel. When Achilles was born, his mother, the nymph Thetis, had dipped him into the river Styx to confer immortality, but the spot where she held him, his heel, remained dry. Paris is said to have hit that one spot with his arrow, but Paris wasn't that good a marksman. He could only have hit it with divine guidance--in this case, with the help of Apollo.

A Madman Kills and Disgraces Hector

861 BCE

Achilles met Hector in single combat and killed him. Then, in his madness and grief over Patroclus, Achilles dishonored the Trojan hero's body by dragging it around the ground tied to his chariot by a belt. This belt had been given Hector by the Achaean hero Ajax in exchange for a sword. Days later, Priam, Hector's aged father and the king of Troy, persuaded Achilles to stop abusing the body and return it for proper burial.

Patroclus Fights as Achilles

860 BCE

Achilles had a dear friend and companion at Troy named Patroclus. In the movie Troy, he is Achilles' cousin. While that's a possibility, many consider the two not so much cousins, in the sense of "son of one's uncle," as lovers. Patroclus tried to persuade Achilles to fight because Achilles was so capable a warrior that he could turn the tide of battle. Nothing had changed for Achilles, so he refused. Patroclus instead fought as Achilles to spear his enemy.

The Action of the Iliad Begins in the Tenth Year

850 BCE

Well-matched forces dragged the Trojan War on and on. It was in its tenth year when the climactic and most dramatic events finally took place. First, a sacrilegious Agamemnon, leader of all the Achaeans (Greeks), captured a priestess of Apollo. When the Greek leader refused to return the priestess to her father, a plague struck the Achaeans. This plague may have been bubonic since it was connected with the mouse-aspect of Apollo.

Trojan War Draft Dodgers

800 BCE

Agamemnon had trouble rounding up the men. Odysseus feigned madness. Achilles tried to pretend he was a woman. But Agamemnon saw through Odysseus' ruse and Odysseus tricked Achilles into revealing himself, and so, all the leaders who had promised to join did so. Each leader brought his own troops, weapons, and ships and stood, poised to sail, at Aulis.

The Abduction of Helen

720 BCE

Menelaus had been aware of the possibility that his wife, Helen, would be snatched from him. Helen had been snatched before their marriage, by Theseus, and she had been courted by almost all the Achaean leaders. It was on the basis of this promise that Agamemnon was able to coerce the Achaeans to join forces with him and his brother and sail against the Asian city-state of Troy to win back Helen.

Judgement of Paris; Helen

700 BCE

In return for Paris' judgment, Aphrodite promised Paris the most beautiful woman in the world, Helen. This world-class Greek beauty is known as Helen of Troy and called "the face that launched a thousand ships." Perhaps it didn't matter to the gods--especially the goddess of love, whether Helen was already taken, but for mere mortals it did. Unfortunately, Helen was already married. She was the wife of King Menelaus of Sparta.