Stenner is a British soldier that participated in Operation Shear.
During the events of Operation Shear, Stenner was placed under the command of Lieutenant Childress in the 24th SAS Regiment's H-Squadron's K Troop. As the company split up, Stenner was placed under the temporary command of Sergeant Brierley, where their unit was sent ahead of the rest of K-Troop to try and take a Chimeran bridge and reinforce Lt. Stephen Cartwright.
With the arrival of Sgt. Nathan Hale, K-Troop is able to eventually capture the Chimeran bridge, preventing Chimeran forces from overrunning Cartwright and his men.