The Engineers at Vicksburg, Part 25: Siege Engineers
Thayer’s Approach to Confederate fortifications on Fort Hill Ridge is visible from the tunnel sappers dug through a ridge on approach. The National Park Service at Vicksburg National Military Park has preserved and restored the tunnel for visitors to see first-hand the magnitude of the sappers’ task.

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Photo by: Mike Petersen |  VIRIN: 170630-A-YL201-003.JPG