Sorry, wrong song. Not THE RISING OF THE MOON but THE FOGGY DEW. Just found a recording by Patrick Galvin Songs of the Easter rising Liner notes "Set to the tune of an old traditional Love song. New words by Rev. P O'Neill. New words 1st verse as follows:

As down the glen one Easter morn to a city fair rode I,
And Ireland’s lines of marching men in squadrons passed me by.
No pipe did hum. No battle drum did sound its loud tattoo,
But the angelus bell o’er the Liffey’s swell rang out through the foggy dew.

What is the name of the original love song?