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1870s
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defenses development earlier earthenwork earthwork east forts francisco guns heavier here kind like made masonry military now obsolete obsolete1 providing san war wereBattery East From The 1870`s, The Kind Of Military Defense That Made Earlier Defense Obsolete, 2. Editorial Image
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Battery East from the 1870`s, the kind of military defense that made earlier defense obsolete, 2. #110996456
Description
With the heavier guns of the American Civil War providing that masonry forts were now obsolete, development of earthwork defenses were begun, like Battery East, here on the San Francisco coast.
This image is editorial
