Ender's Game: climax

Ender's Game
Orson Scott Card
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What is the climax of your novel? What is an event that leads up to it? 

*****Reading about the climax of this book would be a great spoiler (sorry that I spoil all the time)*****

The climax was mentioned in my previous post, which was about obstacles. Ender and his team are taking the final test for the Command school. The battle is very challenging because of the enemy's outnumbering army, new formations, and very unfamiliar situations. Ender lost many of his fighters and was putting a lot of risk into the battle. But Ender and his team managed to win the final test. Then here comes the climax: Ender is then told that the battle wasn't just a simulation, that it was the third and the final invasion of the buggers. Ender is very shocked that he had killed an entire species and the fighters that he had put to die to win. The climax in this book is set at the end of the book so, the book ends that he feels very guilty but then finds a bugger egg.