The North Korean troops were in a rice field west and on the hills east of the road.
South Korean troops suffered much more heavily during the fight.
North Korean troops immediately chased after him opening fire.
South Korean troops were sent to the city and they fired at the demonstrators, killing some 2,000 civilians.
South Korean troops take part in the annual winter training exercise.
South Korean troops killed hundreds in crushing a similar student movement in 1980.
He was encouraged to note that his own security forces clearly outnumbered the Korean troops lining the street.
Four South Korean troops were reported killed, 18 wounded, one missing.
North Korean troops were initially not aware of his identity.
By 1972, he said, South Korean troops were responsible for 70 percent of the front line.