what happens in the beginning of chapter 10 "Dragon"?

Graff and Anderson discuss their plan to promote Ender to commander at age 9, even though most students must wait until age 11. They sadly perceive that now that Ender is finally happy, they will ruin him again--for the sake of saving the world.

Ender becomes commander of a reconstituted army called Dragon, which had been known for poor scores. Ender's soldiers are mainly young and inexperienced soldiers. When Ender arrives at his army's barracks, he immediately goes to work forming them into a respectable force. He hustles them out the door to practice after just three minutes, despite the fact that some of the boys are still naked.