 Members of Task Force <unk> who escaped from Hill <unk> brought back considerable intelligence information of North Korean activity in the vicinity of the <unk> ferry crossing site . At the ferry site the North Koreans had put in an underwater bridge . A short distance downstream , each night they placed a <unk> bridge across the river and took it up before dawn the next morning . <unk> parties of 50 civilians guarded by four North Korean soldiers crossed the river continuously at night , an estimated total of 800 @-@ 1 @,@ 000 carriers being used at this crossing site . 
