Found this song sheet at The Library of Congress American Memory Collection:

BUMMERS, COME AND MEET US.
(H. De Marsan, Publisher, 60 Chatham St. New York; no date)

McClellan is our leader now, we've had our last retreat; (3x)
We'll now go marching on.
Say, brothers, will you meet us? (3x)
As we go marching on.

Thomas turned a SOMERSET, and gave the Rebels rats; (3x)
And sent them rolling home.
Oh, brothers, we will join him; (3x)
And send them rolling home.

How are you, Johnny Bull, old boy? How are you, Johnny Bull? (2x)
If you want to fight, old Roast Beef, you will get your belly full,
And then go rolling home.
Oh, Johnny, don't you fight us; (3x)
Or we'll send you rolling home.

We'll have a farm in Dixie, boys, and put some niggers on it; (3x)
And, then, we'll simmer down.
Oh, sisters, come and join us; (3x)
Way down in Dixie's Land.

Oh, boys, we'll sip our cobbler's then, and cloud our Meerschaum pipes; (3x)
Way down in Dixie's Land.
Oh, bummers, come and meet us; (3x)
Way down in Dixie's Land.

There lies the whiskey-bottle empty on the shelf; (3x)
But there's more in the Demi-John.
Oh, bummers, don't you leave us; (3x)
We'll soon go marching on.

The girls we left behind us, boys, our sweet-hearts at the North; (3x)
Smile on us as we march.
Oh, sweet-hearts, don't forget us; (3x)
We'll soon come marching home!