Ralph defends Piggy from Jack when he refuses to help with the fire. Ralph argues that Piggy contributes by thinking and suggesting ideas, even if he is physically unable to help. Ralph recognizes Piggy's value to the group beyond just physical labor.
After Jack leaves to go to Castle Rock, Piggy becomes more confident with himself, and starts to stand up for himself. This happens because Jack stole Piggy's glasses, and now he can no longer hide behind his disability of not being able to see.
Jack
Piggy
Jack orders the boys to kill Piggy and Ralf.
Piggy's glasses.
Roger and Maurice are the ones that attack Jack and Piggy because Jack wants Piggy's glasses.
Ralph and Piggy develop personal-friend bonds, Ralph playfully teases Ralph while the other boys condescend him, Ralph is the only boy who defends Piggy however. Piggy stresses that Jack is against civility, which Ralph stands for, Piggy says that Jack holds no regard for Piggy, nor any concern for him.
In the story "Lord of the Flies", Jack scolds Piggy for speaking out of turn. Jack slaps Piggy across the face, breaking one of the lenses of his glasses.
ralph to piggy
Simon retrieved Piggy's spectacles after Jack had knocked them off, when he had smacked Piggy across the head.
Piggy is the boy who does not dance at Jack's first feast in "Lord of the Flies." He is not physically capable of dancing due to his asthmatic condition, and he also struggles to keep up with the other boys due to his lack of physical fitness.
To show his power