Douglas County prosecutors filed an aggravated battery charge Monday against a 19-year-old Lawrence man accused of punching and injuring a 25-year-old man during a fight just before 1 a.m. Sunday at Cadillac Ranch, 2515 W. Sixth St. Kim Murphree, a Lawrence police spokeswoman, said a witness alleged the suspect, Michael S. Campbell, struck the victim in the face. The victim went to Lawrence Memorial Hospital by a personal vehicle, Murphree said, and officers arrested Campbell. A judge set bond at $15,000.