Area residents have dug the tunnel, individual tunnels to avoid the RAID sweeps of the French army and to provide shelter for the Viet Minh forces. Every village to build a private tunnels, then demand between the villages and tunnels, tunnels system have been interconnected to form a complete system of tunnels, complex, later develop elsewhere, most are 6 communes North of Cu Chi and the structure of the tunnel segments improved tunnels, become the place of conceal combat, forces can communicate, support each other.
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