Note: the William Henry mentioned frequently in these documents, and in some of the correspondence related to this Allentown armory,
is not William Henry of Lancaster (1729-1786). He is another William Henry ("of Philadelphia"), who was appointed one of the City Lieutenants of Philadelphia on June 6, 1777.
On March 17, 1777, PA legislators passed a law that compelled all men between the ages of eighteen and fifty-three to enroll in the militia and, to enforce this statute, they created "lieutenants" and sub-lieutenants in every county and in the city of Philadelphia.
William Henry resigned from his city lieutenant position only in September 1790 (long after WH of Lancaster had died). He was a colonel and is always referred to as "Col. William Henry." (WH of Lancaster did not have a military title.)
This information is needed to understand this letter (also published in 2 PA Archives 3: 139). Colonel William Henry (City Lieutenant of Philadelphia) is concerned with the Allentown armory because it had been under his jurisdiction in Philadelphia (before it moved to Northampton County).