The first line of Warfield's song: "I am a gallant hero, the southerners ne'er could frighten" has been quoted in another Mudcat thread: "Irish Emigrant Ballads and Songs Index where someone has listed all the songs from this book:

Irish Emigrant Ballads and Songs, edited by Robert L Wright (Bowling Green, Ohio : Bowling Green University Popular Press, ©1975)

(If you click the link, it might show you where you can find the book in a library near you.)

I see that my own local library system has a copy, but it would take a few days to get it.