This question was asked, and answered, in a previous thread:  The night visit by christy moore

Lyrics are also in the Database, here:  As I Roved Out

The song is more usually known as Sixteen (or, Seventeen) Come Sunday, sometimes as The Trooper and the Maid.  There are some other versions in the Forum:

As I Roved Out  As recorded by Makem/ Clancy.
Sixteen Come Sunday  as recorded by the Bothy Band.
I'm Seventeen Come Sunday  English version from Lincolnshire (1905).

In the database:

The Trooper and the Maid  Scottish version.
The Light Dragoon  English version from Mike Waterson.
Yon High High Hill  Scottish version.
Rocky mountain  American version (Kentucky, 1953).

Malcolm