The delayed report to the state’s attorney’s office of teen age hoodlumism at a dance at Jo liet Township High school Friday night has brought quick results. Following a conference today with the teachers who were injured, State’s Attorney Frank H. Masters Jr. filed informations charging Robert Endress, 20, 711 Oneida Street, a student at Michigan State university, Lansing, Mich., with the crime of aggravated as sault and battery. Two separate charges were filed by the state’s attorney charging Endress with assaults on Walter A. Rodby, 819 Buell avenue, and Louis Engelhardt, ‘703 Clement Street, teachers at the high school. As a result of the assaults by Endress, Rodby suffered a frac ture of his kneecap and Engel hardt’s head was split open re quiring five stitches to close the wound. The charges filed by the state’s attorney are based upon a pro vision added to the Criminal Code at a recent session of the legisla ture and provide for more severe penalties where an assault re sults in severe personal injury. The penalty that may be imposed by the county court is a fine of $100 or imprisonment in the coun ty jail for a term of up to one year or both. The teachers who were injured signed complaints against Endress. In so doing they told the state’s attorney that while they bore no ill will against Endress they felt obligated to do so in order to im press other young people with the seriousness of the consequences that should properly follow such acts and to protect other teachers from unprovoked assaults in the future. In filing the charges against Endress_ the _ state’s attorney Stated, “Will county and _ Joliet have been fortunate in the low rate of juvenile delinquency that they have enjoyed and particular ly with regard to incidents in con nection with schools. It is my hope that our action in this case will serve as a warning to others that such conduct will be dealt with swiftly and will serve as a protection for our teachers.” Altho not reported to the state’s attorney, reliable sources also dis closed incidents in two other Jo liet area grade schools. At one school a woman teacher was knocked down by a pupil and re portedly injured. Egg throwing took place at the other grade school.