I've checked out the DT and it doesn't have quite the version I know, which I thought was generally known, being from, I think, one of the Community Songbooks published when such things were published. It is, therefore, a "decent" version!

As sweet Polly Oliver lay musing in bed,
A sudden strange fancy came into her head,
Nor mother nor father shall make me false prove,
I'll list for a soldier and follow my love.

So early next morning young Polly arose,
And dressed herself up in her dead brother's clothes,
She cut her hair close and she stained her face brown,
And went for a soldier to fair London Town,

Then up spoke the sergeant one day at his drill,
"Now who's good at nursing, a captain lies ill?"
"I'm ready. said Polly, to nurse him she's gone,
And finds 'tis her true-love, all wasted and wan.

(I can't quite recall the next two lines, or part of the third, concerning what the doctor said.)
.......when Polly Oliver had nursed back his life,
He said "You have cared for him as if you were his wife."

At this Polly Oliver she burst into tears,
And told the good doctor her hopes and her fears,
And very soon after, for better, for worse,
That captain he married his pretty soldier nurse.

I will look for the missing part and post it sooner or later, depending whether I find it in a copy of Singing Together, or at my father's house over Easter.

The tune differs from that in the DT, and when I've got it in a postable form - at present I'm trying it by ear in Noteworthy, I'll post that, too.

Penny