Police combed a cornfield in Tipton County in search of a fugitive who escaped from a corrections officer early Thursday morning after a robbery arrest on Wednesday.Officers from the Tipton County Sheriff's Department, Tipton Police Department, Hamilton County Sheriff's Department and Indiana State Police are trying to find John Dauenhauer, 35.Officers searched a three-square-mile perimeter in the area of county roads 300 South and 200 East, south of Tipton.The Tipton County Sheriff's Department said Dauenhauer assaulted the corrections officer before escaping from Tipton Hospital about 1:15 a.m.Dauenhauer, who has an extensive criminal background, is about 6 feet 2 inches tall and weighs about 200 pounds. He has blue eyes, brown hair, a goatee and multiple tattoos, police said.Dauenhauer was wearing blue jean shorts, a gray T-shirt, and gray tennis shoes, police said.Tipton police Capt. Gordon Tocco said Dauenhauer robbed a Medicine Shoppe pharmacy at 110 Mill St. on Wednesday evening, taking prescription medicine."He ordered the employees of the pharmacy into a restroom and told them not to leave the restroom for 10 minutes after he left," Tocco said.Police were aided by a man who saw the suspect walking through an alley and took a cellphone picture of him and the car he got into that included a license plate.Investigators tracked the car to an Elwood address, and Dauenhauer was arrested when he arrived home. Police said they found the prescription medicine taken from the pharmacy in the car.Dauenhauer was taken to the Tipton County Jail, but workers there were concerned that he may have taken medication at the time of the robbery. Dauenhauer had been taken to Tipton Hospital for evaluation before the escape.A Tipton County deputy said he saw Dauenhauer walking about 6 a.m. without handcuffs and smoking a cigarette in the area where the search is ongoing.A farmer brought out a combine to clear the corn in the field, and officers are hoping it will flush out the suspect.Tipton Community Schools went to class on a two-hour delay during the manhunt.Residents were urged to keep their doors locked and their vehicles secured. Police asked anyone with information to call 765-675-2111. Watch 6News and refresh this page for updates.