CHICAGO (WLS) -- A man has been charged with trying to disarm a Chicago police officer while resisting arrest Saturday morning in the city's Lake View neighborhood.A motorist alerted officers on patrol of an ongoing battery on the 900 block of West Belmont at approximately 3:05 a.m. Saturday, Chicago police said.After arriving on the scene, a 29-year-old woman pointed to a man, identified by police as 29-year-old Lamar Brown, who she said struck her with a closed fist, police said. While attempting to arrest Brown, he resisted and tried to disarm one of the officers, police said.After Brown was placed into custody, a 30-year-old man told police that before they arrived, Brown tried to steal his wristwatch and punched him as well as punching a 29-year-old woman who tried to intervene, police said. Both refused medical attention at the scene.One of the responding officers was treated for non-life threatening injuries at Illinois Masonic Medical Center and released.Brown has been charged with attempted robbery, two counts of aggravated battery in a public place, attempt to disarm a peace officer and resisting arrest.