This nursery rhyme is about the Gunpowder Plot which took place on the 5th November in 1605 when Guy Fawkes and his co conspirators attempted and failed to blow up the Houses Of Parliament. Every year on the 5th Nov is Guy Fawkes Night or Bonfire Night to commemorate this!
Remember, remember, the 5th of November,
Gunpowder, treason and plot.
I see no reason
Why gunpowder treason
Should ever be forgot.
Guy Fawkes, Guy Fawkes, 'twas his intent
To blow up the King and the Parliament
Three score barrels of powder below
Poor old England to overthrow
By God's providence he was catch'd
With a dark lantern and burning match
Holler boys, holler boys, let the bells ring
Holler boys, holler boys
God save the King!
https://youtu.be/L7hHL33lQ0I