Thayer's Approach Tunnel

To advance to the Confederate defense line, the Union soldiers along this section of the line, who were commanded by Brigadier General John M. Thayer, excavate a tunnel through the ridgeline. After that they were able to begin digging the approach trench toward the Southern position on order to place a mine under the defense line. Thayer's soldiers had nearly completed the mine when Vicksburg surrendered.
The tunnel is now part of the Vicksburg National Military Park.

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Source

• Text: Fedor de Vries
• Photos: Wikimedia Commons