Cleaning My Gun Lyrics

Lyric discussion by DanPerry 

Cover art for Cleaning My Gun lyrics by Mark Knopfler

What is Old Damnation? It sounds like vernacular for something and yet a Google search reveals little of use. I've seen it posited that this refers to a case of ammunition for the coming battle against Blarney & Malarkey. Yet somehow, I sense he is more likely talking about a case of whiskey.