The Foggy Dew is a song about the Easter Uprising of 1916

Not the one I'm thinking of, Fal. Best known English version at:
http://www.su.nottingham.ac.uk/~ramsoc/about/songs_efg.htm#foggy

A somewhat different version, with helpful notes, supportive of the foggy dew=bugaboo line, is at:
http://mysongbook.de/msb/songs/f/foggydw1.html
Worth checking this out.

Actually it looks like there are three versions of Foggy Dew, two concerned with love rather than 1916, and mine being known as Foggy, Foggy Dew:
http://www.contemplator.com/folk/foggy.html
There are midi files to download at this site, for those who want to hear the tunes.