French-led troops and associated Vietnamese units left Cao Bằng along Route Coloniale 4 as Việt Minh forces tightened pressure on the frontier. The withdrawal exposed the danger of the French isolated-post system and the importance of local knowledge and coordinated resistance.
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Eventonan Relashoná
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The French column left Cao Bằng on 8 October 1950.
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Splikashon
The column left Cao Bằng on 3 October; the later fighting trapped the relief column.