what was be expected at Gulliver in the case of war with blefuscu? Did Gulliver approve of it? Why did he agree to it?

It is expected that Gulliver be a an ultimate weapon against the army of Belfuscu. At first Gulliver agrees to this. Gulliver proves to be very useful by dragging the entire Blefuscudian fleet of ships to the shore of Lilliput. The Emperor wants Gulliver to return and finish them off but Gulliver refuses.