Card begins his novel with an example of violence: Stilson’s bullying.  This earth-bound incident sets the tone for Ender’s reaction to conflict, by not submitting to “the enemy’s will.”  His relationship with his older brother, Peter, who should automatically be his superior, is another example of Ender’s resolve. In his trial battles in the training room, too, Ender demonstrates his refusal to submit (note particularly his battle with Bonzo); even in his relation with the trainers themselves, Colonel Graff for example, he refuses to submit.  All this attitude leads to his final resistance to the Buggers; what gives the novel its depth, however, is his final treatment of the Bugger colony he finds after the final battle.  Throughout the novel, a clear example of a Bildungsroman, Ender demonstrates his leadership by refusing to be bullied or even to being subjugated; his final battle with the Buggers is even disguised as another exercise.