"Croppies Lie Down" is a British folk song, dating from the 1798 rebellion in Ireland, that celebrates the defeat of the Irish rebels.
"Croppies" meant people with closely cropped hair, a fashion associated with the French revolutionaries, in contrast to the wigs favoured by the aristocracy.
In George Borrow's 1862 travel book Wild Wales, the author comes upon an itinerant Irish fiddler and asks him to play the tune.
The rebels so bold, when they've none to oppose, To houses and haystacks are terrible foes; They murder poor parsons and likewise their wives, At the sight of a soldier they run for their lives; Whenever we march over country and town In ditches and cellars the croppies lie down.
Should France e'er attempt, by fraud or by guile, Her forces to land on Erin's green isle, We'll show that they n'er can make free soldiers, slaves, They shall only possess our green fields for their graves; Our country's applauses our triumphs will crown, Whilst with their French brothers the croppies lie down.