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August 1863. "Bealeton, Virginia. Army of the Potomac headquarters. Captain Henry Page, Assistant Quartermaster." Seen here a few weeks ago minus his two-legged friend. Wet plate glass negative. View full size.
Or is the guy on the left flailing in an attempt to "turn the Page"?
He's there to get the horse's attention for that classic ears pricked forward look. An arm waver out of frame is still used today to get this sort of equine shot. The next time you see a similar horse-and-rider photo you can bet there's someone out in front clucking and waving.
The final test of discipline in an Army horse is whether or not it can resist the temptation to wave back.
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