"These two words greatly stimulated Wei Dangxian.He suddenly drew his sword.With a ringing clang, a sharp, clear blade sliced through the air.Then, a cacophony of clanging metal erupted.The first to r... saltpeter mines, one large and one small. Over the years, we've accumulated quite a stockpile. I can immediately dispatch people to deliver the saltpeter. If Qin still needs more, increasing producti...