As the anti-war movement gains momentum, Meg and Sam get caught in the crossfire at an anti-war rally and finds themselves taking a stand that may have severe consequences in their future. Jack also takes a stand on Beth and her marital status as he begins his campaign for city councilman. Helen makes a shocking discovery at work and Patty , disappointed with her first date, turns to Roxanne for advice. Meanwhile, JJ and his squad are surrounded by the Viet Cong and under heavy gunfire when they are told they will not be receiving backup and will be on their own