In the course of his travels the ship in which he was a passenger was attacked by pirates, and John Howard showed himself as brave in actual battle as he was in fighting abuses; for he loaded the big gun with which the ship was armed nearly up to the muzzle with nails and spikes, and fired it into the pirate crew just in time to save himself and his companions from destruction. The books in which he gave an account of his experiences were eagerly read by the public, and produced a profound effect.