 At the conclusion of Operation Hickory, all participating units joined Operation Prairie IV sweeping the area southwest of Con Thien.On 28 May 3/4 Marines ran into a bunker complex on Hill 174, 6 km southwest of Con Thien.Companies M and L attacked the complex but were forced back by small arms, machine guns, 57mm recoilless rifle and 82mm mortars for the loss of 2 Marines killed and 21 wounded.