One
of the most vulnerable areas was in a gorge where Highway 9 crossed the Ruo Quan River about half way
between Ca Lu and Khe Sanh called the "Hairpin". This was evident by the
two bridges which had been blown out when the Vietnamese were fighting the
French. After the first bridge had blown out a Bailey bridge had been
erected, but the center support was later blown out making it useless to
vehicles. The majority of the planks had been removed torn up and taken
away, but there remained one row which allowed it to still be used as a
foot bridge by the Montagnards when traveling to and from market in Quang Tri.
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