Here is a scanned book on the internet that mentions this regiment being raised and sent to Peekskill, NY in 1778. It doesn't say why Gen. Washington asked for men to be stationed there, but further internet search might reveal this. Footnote.com (pay site) has a pay abstract card for Isaac from the National Archives that says his service was between 5 April (enlistment) and 21 May (discharge), no year given on this card, but undoubtedly the 1778 service mentioned in the book. They reached camp on 9 April. The card also says that they were allowed one day/20 miles travel pay. The daily wage otherwise was 1 pound and 4 shillings. For 1 month and 21 days of service he was due 3 pounds, 8 shillings. "Peeks Kill, Barracks No. 3" was where they were stationed (encamped).

http://www.archive.org/stream/militaryhistoryo00burpiala/mil...

Doug Sinclair