Thanks all. Here are the first couple of verses from one of Backus'
broadsides which was to be sung to this air. It seems to scan fairly well with "Adieu! a heart-warm, fond adieu" as laid out by Mick above.

Vouchsafe thine aid, ye wond'rous nine,
To pen each sad and mournful line,
A tragic scene transpired of late,
The truth of which I will narrate.

On the Plank Road, in Greenville town,
A Jewish pedlar was shot down.
Ah, by the wretch, called Warren Wood,
Who shot the pedlar in cold blood.