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A casemate, an enclosed, protected place for large guns, such as cannon.
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She led visitors around the fort, describing guns and providing a history of the fort, the Civil War and the end of slavery in America. She was an excellent speaker.
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Note the rail so that the gun can be moved right or left.
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The Union later converted most casemates into quarters, and later into a prison.
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A Flank Howitzer. It protected the rear of the fort from an attack by infantry. Three men operated it.
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IMG 6839