ALVINSTON, ON - Knowing how to defend yourself from an attacker empowers young girls to protect themselves.  Just Yell Fire is a FREE program for girls, ages 11 to 19 and their mothers, presented by the Sexual Assault Survivors' Centre of  Sarnia-Lambton.  The program will be held at the Alvinston Library, 3251 River Street, Alvinston.  Pre-registration is required by calling 519 898-2921.