The Waterson's recorded a few Sword Dance intro songs (can't remember on what LP's though). The 1st one you listed is close to the chorus of one they've done (I think they call it Ye Noble Spectators, but I could be wrong). The chorus is:

We are six actors bold, never came on stage before And we will do our best & the best can do no more.

it sings of the villians being conqered in the end by Samson:

When they were all merry carousing with wine
He pulled down the house & slew all in one blow
And that was an end to them all.

It doesn't seem that they'd be the same tune though.

Barry