 That evening Sergeant Ernest R. <unk> led the patrol of two <unk> <unk> tanks and two <unk> Gun Motor <unk> in <unk> . <unk> placed his patrol on the west side of <unk> near the <unk> ferry . At 20 : 00 a heavy fog covered the river , and at 22 : 00 mortar shells began falling on the American @-@ held side of the river . By 22 : 15 this strike intensified and North Korean mortar preparation struck A Company 's positions . American mortars and artillery began firing <unk> . Some of the A Company men reported they heard noises on the opposite side of the river and splashes in the water . 
