First stanza as above.

McDowell was our commander, a general through and through,
With infantry and cavalry, all of us true blue.
The people how they cheered us as we marched from Washington;
But stripped to the pants, we did advance at the battle of Bull Run.

The Stone Bridge was their standing place, and still we did advance.
We marched across the open field, everything left to chance.
The rebs will never forget us, and the wonderful race we run,
When, stripped to the pants, we did advance at the battle of Bull Run.

So here's to old McDowell, he fought among the best.
And here's to the Yankee infantry, the cavalry and the rest.
And don't you forget the Irishmen and the wonderful deeds we done,
When, stripped to the pants, we did advance at the battle of Bull Run.