The Philip Pry house was built in 1844 by Philip Pry and his brother, Samuel, on high ground west of Keedysville, Maryland. The house is a two-story, L-shaped brick structure on a stone foundation with a steeply pitched roof with two single chimneys. At the time of the battle, the farm grounds included then a barn, smoke house, cave house, a springhouse and a toll house. Because of its panoramic view of almost the entire Antietam Valley around Sharpsburg, Pry's prosperous farm and home was taken over by Union commander George B. McClellan to use as his headquarters during the Battle of Antietam.
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After the battle, the Pry House served as a Union hospital, as well as the headquarters for Maj. Jonathan Letterman, Medical Director of the Army of the Potomac. It was here that Letterman reorganized the army's medical department, including codifying field hospital administration and developing medical logistical operations of the Army of the Potomac, procedures that are still used in one form or another in the modern military, 150 years later.
Today the Pry House is home to the National Museum of Civil War Medicine. Exhibits include a re-creation of an operating theater, interpretive panels and objects relating to the care of wounded and the effects on the civilian population in the area. Take the opportunity to walk in the footsteps of Abraham Lincoln who visited the house two weeks after the battle to visit the mortally wounded Israel Richardson, Union general who died in the Pry House on November 3, 1862.
Proceed to N 39° 28.553 W 077° 42.814 and use the center portion of the marker with the heading "Signal Station" to glean information for the following puzzle:
Substitute numbers from the marker into the following Coordinates: N 39° 28.ABC W 077° 42.DCC where:
A = the number of men in the photo in the "Army Headquarters" section of the marker.
B = the number of letters in the last name of the General that President Lincoln visited in October.
C = the number of animals in the photo in the "Army Headquarters" section of the marker.
D = the number of letters in the last name of the General that President Lincoln visited in October MINUS one.
The cache you seeek is hidden just a short drive away from this historical marker. The container you seek is a large sized pill bottle containing a few logsheet/stashnote combinations but no room for a stylus so be sure to BYOP!