When last we left our heroes, they were heading off to beat those women-snatching Trojans into a good ol’ foreign pulp. Yup, Helen had escaped, and because she was the only woman for Menelaus, the entire nation of Greeks (newly formed) were going after her.
There was trouble on the way to Troy. See, Agamemnon had become a super powerful King, and now that he was ruling over all these other Kings, he felt like he wasn’t beholden to anyone. This was called hubris, and inevitably meant that you were about to run afoul of some god. Agamemnon had it coming in spades.
Sure enough, he went a-hunting and shot this deer in a grove that was sacred to Artemis. She was livid. I mean, Agamemnon’s father had already tried to pull the wool over her eyes, so this was the last straw.
As punishment, she changed the winds so that all the ships got stuck in the port at Aulis. Since there were one thousand ships, all bursting with warrior types, it was a recipe for disaster. Imagine if your wagon train in Oregon Trail got stuck, and you weren’t allowed to hunt for food! Eventually, Agamemnon consulted his seer, and learned he would have to sacrifice his oldest daughter, Iphigenia, to appease the gods.