Swartz, Roger G. Frankstown: Anatomy of an Ambush. Hockessin, Delaware: Blue Path Press, 1995. First Edition. ISBN: 1887109013.
Brown pictorial wrappers, 6 1/2 x 9 inches, 148 clean and unmarked pp. Fine. Paperback. 
"The body of work herein represents the ambush at Frankstown (south of present-day Altoona and west of Hollidaysburg) that occurred early Sunday morning, June 3, 1781. It involved four principal forces that often met on the Pennsylvania frontier. These were: the Pennsylvania rangers and militia, who were primarily responsible for frontier defense; and Butler's Rangers and their Iroquoian allies, who were responsible for implementing British war strategy as it concerned the frontiers." - from the Introduction.