horse-trooper

'The ballad,' says Professor Child, 'is one of the best in the world, and enough to make a horse-trooper of any young borderer, had he lacked the impulse.'

Ballads of Scottish Tradition and Romance Popular Ballads of the Olden Times - Third Series Various

I remark that he rhymes it himself with horse-trooper.] [Footnote 3:

The Complete Poetical Works of James Russell Lowell James Russell Lowell 1855