SANDUSKY, Ohio (AP) — A northern Ohio man faces up to eight years in prison over a hay ride accident that injured 28 people last year.

Investigators say Michael Hermes (HERM'-ess), of Sandusky, had been drinking and was operating a tractor pulling several wagons when he drove off the road.

Hermes pleaded guilty last week to assault and operating a vehicle under the influence. He'll be sentenced in January.

State Highway Patrol troopers say there were open alcohol containers at the scene of the October 2011 crash.

Some of those injured had broken bones while others were just shaken up.