Answer the riddle: according to greek mythology, how did the trojan war began with an apple and end with a horse?

It all began when Eris the Goddess of Discord discovered she was un-invited to the wedding of Peleus and Thetis. She was so mad she decided to come anyway and threw the fruit of temptation, The Golden Apple. the horse is because they made a big wooden horse and all stayed inside of it they then told the other side it was a 'ggift" but at night all of the trojans jumped out and killed them.