The Simpsons, Season 1, Episode 5 : Bart the General

The Simpsons, Season 1, Episode 5 : Bart the General
Directed by David Silverman
Written by John Swartzwelder
Original TV AirDate February 4, 1990

Bart runs afoul of Nelson Muntz, the school bully, who begins attacking Bart every day after school. Homer suggests fighting back, which does not work. Desperate for a solution, Bart visits Grampa for advice. Grampa takes Bart to meet Herman, who suggests that Bart rally all of the school children and declare war on Nelson. Bart and his army attack Nelson and successfully manage to convince him to give up his bullying ways.