In versions that I've heard, this verse goes after the second in achan's post:

O the night fell black and the rifles' crack
Made "Perfidious Albion" reel
'Mid the leaden rail, seven tongues of flame
Did shine o'er the lines of steel
By each shining blade, a prayer was said
that to Ireland her sons be true
And when morning broke still the war flag shook
out its fold in the foggy dew

and this verse is last:

And back through the glenn I rode again
And my heart with grief was sore
For I'd parted then with valiant men
Whom I never shall see more
But to and fro in my dreams I go
And I kneel and pray for you
For slavery fled the glorious dead
When you fell in the foggy dew