Maybe the confusion is due to there being two songs titled 'The Croppy Boy' ('croppy' from short cropped hair, the style of the French revolutionaries).

One, you have given, starting 'twas early, early in the spring'.

The second starts, 'Good men and true in this house who dwell, to a stranger buchaill (young man) I pray you tell'. This is the version that refers to Geneva Barracks, in Wexford, named afer a Swiss settlement.

I'd be very surprised if both versions weren't online.