They went into the dark woods to use the bathroom and some older 7th grade boys started bullying them and being terrible to Auggie. Henry, Miles and Amos came to their rescue.
In this story, August is depicted as a boy who undergone several surgeries which make his face looked physically unappealing for children around him, which make a lot of kids around August to constantly bully him.
When henry, miles, and amos saw the event, they pushed the 7th graders to the ground and told August to run into the cornfield.