The inside of a blockhouse is made up of
a series of hinged slots in the walls for rifling.
Soldiers could defend the fort from all four
sides, a 2nd tier, and the roof.  A blockhouse
was by far the safest place to be in an attack.

Ft. Lincoln Websites
Fort Abraham Lincoln Foundation
Fort Abraham Lincoln State Park

See more North Dakota tours @
RealND.com

 Infantry Blockhouse - Interior View

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