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Three U.S. Navy ships, from left, the Macedonian, the Dale, and the Savannah anchored at the south wharf of West Point, Hudson River, New York 6-14-1868 von George Lane
Über Flickr:
The USS Savannah and Macedonian were old warships used as training vessels for the cadets at Annapolis at the time. Perhaps the USS Dale was also a training ship. Not sure why the cadets at Annapolis were visiting the Army cadets at West Point.