Malcolm, the Dransfields' first couple of verses are slightly different from what you remember:

As I crossed over Salisbury Plain
What a dainty fine sight I behold
As lasses were crying and tearing their hair
Oh the rout has just come for the Blues
Oh the rout has just come for the Blues.
Then each one home to their mothers do run
Saying, 'Me heart is undone, it is true
I'll pack up me clothes without more delay
And boldly I'll march with the Blues
And boldly I'll march with the Blues'

The last 3 lines of the third verse are:

And each one poured out a bottle of gin
To drink a good health to the Blues
To drink a good health to the Blues

They repeat the first verse after the final 'They're as gallant' verse.

Cheers, Stewie.