LAMBERTVILLE — A youth baseball umpire struck out Sunday at a man he thought had taken his cell phone and was arrested on charges of simple assault and disorderly conduct.

Carl Ippolito, 52, of West Amwell Township believed that his cell phone had been stolen from his car, which had been parked on North Union Street.

He used an application on his son’s phone to track his missing cell phone to the towpath between Elm and Cherry streets, police reported. Near Niece’s Lumber he found Brent Johnson, 27, of East Brunswick talking on an iPhone and confronted him.

Police said that Johnson tried to walk away, but Ippolito grabbed his shirt, pulled the younger man to the ground and punched his head and body. Johnson’s chin was cut.

Ippolito later learned that he had inadvertently left his cell phone in the snack shack at the baseball field, where he had been umpiring a youth baseball game, police said, and it was still there. Patrolman Vince Albani investigated.