There were several broadside ballads written on the battle of the Boyne, July 1, 1690. (See the broadside ballad index on my website) They were from early reports and contained little real news. They didn't mention that Duke Schomberg started to cross the Boyne (without his sword according to one source), but Irish cavalry made short work of him. Maybe he figured it was his time.

On Schonberg who holds predistination & talks to himself [c 1689-90]

As I walk'd by my self & talk'd to my self
My self said to me
Look to thy self, take care of thy self,
For no body cares for thee.

I answered my self & said to my self
With the self same repartee
Look to thy self, or not looke to thy self,
The self same thing shall be.

............

Tune is "Greensleeves" according to Herd's 'Scots Songs'. See the Opies in The Oxford Dictionary of Nursery Rhymes for later copies.