The US Appalachian versions known as "Pretty Polly" are based on theses stanza of the 1750 and 1776 Gosport Tragedy broadsides:

So with kind embraces he parted that night,
She went to meet him in the morning light;
He said, "Dear charmer thou must go with me,
Before we are wedded, a friend to see."

He led her through valleys and groves so deep,
At length this maiden began for to weep;
Saying, "William, I fancy thou leadst me astray,
On purpose my innocent life to betray."

He said, "That is true, and none you can save,
For I all this night have been digging a grave."
Poor innocent soul! when she heard him say so,
Her eyes like a fountain began for to flow.

[This next stanza about her child is usually missing]

Her hands white as lillies in sorrow she wrung,
Beseeching for mercy, saying, "What have I done
To you my dear William, what makes you severe?
For to murder one that loves you so dear."

He said, "Here's no time disputing to stand,"
And instantly taking the knife in his hand;
He pierced her body till the blood it did flow,
Then into the grave her body did throw.

He cover'd her body, then home he did run,
Leaving none but birds her death to mourn;

Additional text themes come from the broadsides, other sources and the "boarding a ship which sinks" theme may have been adapted from The House Carpenter.

Richie