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Fortifications
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42
Casemates
10
Gun Platforms
10
Army Corps of Engineers
8
Ordnance
8
Armaments
4
Batteries
4
Downtown
4
Fort Detroit
4
Fort Lernoult
4
Fort Shelby
4
Scarp Walls
4
Artillery
2
Barbette Guns
2
Demi-lune Salients
2
Demi-lunes
2
Demilune Salients
2
Demilunes
2
Embrasures
2
Forts
2