László Lukács: Petards in Fortress Sieges
Petards usually remind us of pyro-technical tools of fireworks. It is less known that in the 15th and 16th centuries explosive devices used in fortress sieges were called by the same name. This paper gives a short review of the evolution of the definition of petards during the past 150 years, gives summary of development of the fortress sieges and of those mines that were applied during these assaults. The main types of petards and their technical, structural characteristics are also introduced in this study. The last chapter describes two Hungarian examples from the 16th century when petards were effectively used in attacks against fortresses.
https://folyoirat.ludovika.hu/index.php/mkk/article/view/5120/4376