The armies encounter each other at Gettysburg.
Credit: VITA, METI/NASA, NAVTEQ, USGS, USDA, EPA, DeLorme, Intermap, iPC, Esri, TomTom, EarthSat
The technological limits of surveillance during the American Civil War dictated that commanders often decided where to deploy their troops based largely on what they could see.
From Smithsonian magazine
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