Gulliver tried to please the king by describing the invention of gunpowder?what were its uses according to Gulliver?

Gulliver goes into detail about Gunpowder with the King of Brobdingnag. Gulliver describes how thousands of people can be controlled with Gunpowder. The king is struck with "horror and disgust" by Gulliver's proposals. The king tells Gulliver that if he values his life, he should never mention gunpowder again.