Over the hills and far away is a traditional British folk song and the most iconic song from Sharpe however the song is from 1728 from a play and it's lyrics are about the War of the Spanish Succession.

"Hark! now the Drums beat up again,
For all true Soldiers Gentlemen,
Then let us list, and march I say,
Over the Hills and far away;

Over the Hills and o'er the Main,
To Flanders, Portugal and Spain,
Queen Ann commands, and we'll obey,
Over the Hills and far away.

All Gentlemen that have a Mind,
To serve the Queen that's good and kind;
Come list and enter into Pay,
Then o'er the Hills and far away;
Over the Hills, &c.

Here's Forty Shillings on the Drum,
For those that Volunteers do come,
With Shirts, and Cloaths, and present Pay,
When o'er the Hills and far away;
Over the Hills, &c.

Hear that brave Boys, and let us go,
Or else we shall be prest you know;
Then list and enter into Pay,
And o'er the Hills and far away;
Over the Hills, &c.

The Constables they search about,
To find such brisk young Fellows out;
Then let's be Volunteers I say,
Over the Hills and far away;
Over the Hills, &c.

Since now the French so low are brought,
And Wealth and Honour's to be got,
Who then behind wou'd sneaking stay?
When o'er the Hills and far away;
Over the Hills, &c.

No more from sound of Drum retreat,
While Marlborough, and Gallaway beat,
The French and Spaniards every Day,
When o'er the Hills and far away;
Over the Hills, &c.

He that is forc'd to go and fight,
Will never get true Honour by't,
While Volunteers shall win the Day,
When o'er the Hills and far away;
Over the Hills, &c.

What tho' our Friends our Absense mourn,
We all with Honour shall return,
And then we'll sing both Night and Day,
Over the Hills and far away;
Over the Hills, &c.

The[n] Prentice Tom he may refuse,
To wipe his angry Master's Shoes;
For then he's free to sing and play,
Over the Hills and far away;
Over the Hills, &c.

Over Rivers, Bogs, and Springs,
We all shall live as great as Kings,
And Plunder get both Night and Day,
When o'er the Hills and far away;
Over the Hills, &c.

We then shall lead more happy Lives,
By getting rid of Brats and Wives,
That Scold on both Night and Day,
When o'er the Hills and far away;
Over the Hills, &c.

Come on then Boys and you shall see,
We every one shall Captains be,
To Whore and rant as well as they,
When o'er the Hills and far away;
Over the Hills, &c.

For if we go 'tis one to Ten,
But we return all Gentlemen,
All Gentlemen as well as they,
When o'er the Hills and far away;
Over the Hills, &c."

I do not own the song it’s a piece of traditional British folk music.
Here’s a link to the Gin Lane and John Tams versions of the song.
www.youtube.com/watch?v=Vkjpax… https://www.youtube.com/watch?v=WOeYPpOblAw