For Guest from 2008 who asked about the melody. It’s the old Jacobite song The Jackets Green :

When I was a maiden fair and young
On the pleasant banks of the Lee
No bird that in the greenwood sung
Was half so blithe and free
My heart near leapt with flying feet
No love sang me her Queen
Till down the glen rode Sarsfield's men
And they wore the Jackets Green
https://www.kinglaoghaire.com/lyrics/665-the-jackets-green#s5_video