Mushemeelin and two Delaware companions tracked Armstrong to the Juniata River narrows and, in 1744, killed the trader and his two servants.

[1] U.S. Route 22 (US 22), the William Penn Highway, and the former Pennsylvania Main Line, now the Norfolk Southern Railway's Pittsburgh Line, follow the Juniata River through the Jacks Narrows water gap between Mapleton and Mount Union.

U.S. Route 322 and the former Milroy Branch of the Pennsylvania Railroad pass through the Mann Narrows Water Gap along the Kishacoquillas Creek near Reedsville.

Just below the ridge crest lies the contact between the older Ordovician Juniata Formation on the northwest slope, and the younger more erosion resistant Silurian Tuscarora Formation geologic layer forming the steeper southeast slope and the crest.

The Reedsville forms the less steep lower slope that becomes shallower toward the base of the ridge.