How did Hernán Cortés and his conquistador’s, who were in now Mexico, have enough ammunition to fight the natives while staying for years 1519–1521

Question

How did Hernán Cortés and his conquistador’s, who were in now Mexico, have enough ammunition to fight the natives while staying for years 1519–1521

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Answer 1

I read the books long ago but I remember that some of his soldiers descended to Popocatepel Vulcano to pick up sulfur to create powder. The full story is so unbelievable that if you watched it on  a movie you would not believe it. I recommend reading history of new Spain from Bernal del Castillo