A guilty plea to aggravated assault charges has landed a forty-seven-year-old Chattooga County man with a four-year prison sentence.  Richard Eugene Milstead of a Farmersville Road, Summerville address was sentenced in Chattooga County Superior Court to serve four years in prison and one year of probation on the charges.  He has also been ordered to pay a $1,716 fine in connection with the charges.  Milstead has a long history of arrests in both Chattooga and Floyd Counties on various drug charges and terroristic threats and acts charges.