Two marines have pleaded guilty to torturing an Iraqi prisoner with electroshock.

Pfc. Andrew J. Sting and Pfc. Jeremiah J. Trefney entered their pleas at a May 14 court-martial in Iraq, according to a statement by the 1st Marine Expeditionary Force in Iraq. Lt. Nathan Braden, a Marine spokesman at Camp Pendleton, Calif., released the statement Thursday.

According to the military statement, the pair and two other Marines wanted to discipline the detainee for throwing trash outside his cell and speaking loudly at the Al Mahmudiya prison, a temporary holding facility south of Baghdad. The Marines attached wires to a power convertor, which delivered 110 volts of electricity to the detainee as he returned from the bathroom, the statement said.

Sting pleaded guilty to charges of assault, cruelty and maltreatment, dereliction of duty, and conspiracy to assault. He was sentenced to a year in prison, a reduction of rank, forfeiture of pay and a bad-conduct discharge. Trefney pleaded guilty to cruelty and maltreatment, dereliction of duty, false official statement, violating a lawful order, and conspiracy to commit assault. He was sentenced to eight months in prison, reduction of rank and forfeiture of all pay, and he will also receive a bad-conduct discharge.