HiIt's in the database as "Johnny, I hardly knew ye,"
In the book "Songs of Ireland" they have written,
"Herbert Hughes, writing in his "Irish Country Songs" (London 1934) says, "Johnny .......is a classic case of a song surviving it's period and presenting a problem for the later folklorist.." His father, whose memories went back to the American Civil War, felt that it belonged to that period and came from the States - having probably been in the repertory of the Christy Minstrels. It had been published in L:ondon in1867, but internal evidence dates it back perhaps to as early as1802, when Irish regiments were extensively recruited for the East India service."
Hope this helps
Slainte
Alison