There is a fifth verse;

"With Monckton and Townshend, those brave Brigadiers,
"I think we shall soon have the town about their ears.
"And when we have done with the mortars and the guns,
"If you please, Madame Abbess, a word with your nuns.
"Each soldier shall enter the convent in buff,
"And then, never fear, we shall give them Hot Stuff!"

the full text can be found at

http://www.acronet.net/~robokopp/usa/hotstuff.htm
(I'm sorry, I can't do the blue clicky things)

According the Grosse's "Dictionary of the Vulgar Tongue" (1783 IIRC), "Madame Abbess" was the nickname for a bawd in charge of a brothel - by extension the "nuns" were the ladies of said establishment.

regards

Walrus