Passover 2017 question: What day ....

within the 8 days does God unleash "The Destroyer"? Ive gotten nowhere reading about the holiday. Maybe cause I'm a gentile.

"It happened at midnight – the Lord attacked all the firstborn in the land of Egypt, from the firstborn of Pharaoh who sat on his throne to the firstborn of the captive who was in the prison, and all the firstborn of the cattle. Pharaoh got up in the night, along with all his servants and all Egypt, and there was a great cry in Egypt, for there was no house in which there was not someone dead."

We have to put goats blood on our door so god doesn't kill us