 Two roads ran through the regimental sector from the <unk> River to <unk> . The main road bent south along the east bank of the river to <unk> @-@ <unk> and then turned northeast to <unk> . A northern secondary road curved around <unk> and lakes , the largest of which was Lake U @-@ p <unk> , to <unk> . In effect , the 1st Battalion of the 23rd Regiment guarded these two approach routes to <unk> . 
