There are several records that record the service of Michael Kressler. He is credited by some as having served in the Pennsylvania Line and by others for service as a Ranger of the Frontier. Men who enlisted in the Pennsylvania Line served for at least six months and were prepared to face battle in conflict with the enemy. Often, as was the case in Northampton County, special troops called Rangers were recruited to serve long periods of enlistment to protect the frontier against Indian attacks.
- "An Arduous Service":The Pennsylvania Backcountry Soldiers' Revolution, Gregory T. Knouff, Rutgers University, NewBrunswick, 1994. Online at https://ojs.libraries.psu.edu/index.php/phj/article/viewFile/25116/24885. March 17, 2014.
- The Pennsylvania Archives 5th Series, Volume 8
- Family Trees: WorldConnect Project
- Find A Grave Memorial# 5711867, http://www.findagrave.com