All well, time has passed. ...
The answer is Francisco Montaño, leading a party of Spanish soldiers, was ascended Popocatepetl (17,887ft/5452m) in central Mexico in 1522.
"After his conquest of the Aztecs, Cortés found himself in need of sulfur to replenish his supply of gunpowder. He dispatched Montaño and his party to climb Popocatepetl and obtain the material from the crater. They found the ascent trying due to the cold, temperatures they were not use too in the lower altitudes, but managed to reach the top. To acquire the sulfur, Montaño had to be lowered on a rope down the cliffs surrounding the crater. Despite his fears of falling and going straight to hell, he and his men managed to get hold of a supply of the badly needed yellow powder and return alive."
I would have accepted Cortez as he gave the order. ...
I don't have any particularly compelling questions at present, so I'll leave the floor open to whomever cares to ask a good question.