I learned this tune from Tess Slominski, fiddler with the Washington, DC band Roaring Mary. I like the unusual chordal structure in the B part. It can be found on John Williams’ CD "Steam" as "The Lancers’ Jig".
The Donegal Lancers
~ an earlier submission and take on this “Lancers”:
Submitted on April 5th 2002 by Josh Kane.
1st part sounds like some of these Munster slides…
This is played by Vince Campbell on the Brass Fiddle LP.