 He wrote that some cannons were simply filled with about 100 lead balls, but others, called the "flying-cloud thunderclap eruptor" (飞云霹雳炮; feiyun pili pao) had large rounds that produced a bursting charge upon impact.The ammunition consisted of hollow cast iron shells packed with gunpowder to create an explosive effect.Also mentioned is a "poison-fog divine smoke eruptor," in which "blinding gunpowder" and "poisonous gunpowder" were packed into hollow shells used in burning the faces and eyes of enemies, along with choking them with a formidable spray of poisonous smoke.