When told that he is facing his final test, Ender finds his fleet far outnumbered by the buggers surrounding their queens' homeworld. Hoping to earn himself expulsion from the school for his ruthlessness, he sacrifices his entire fleet to fire a Molecular Disruption Device at the buggers' homeworld. The Device destroys the planet and the surrounding bugger fleet. Mazer informs Ender that the "simulations" he has been fighting were real battles, directing human spacecraft against bugger fleets via an ansible, and that Ender has won the war. Ender becomes more depressed on learning this, realizing that he has committed genocide.