The Spanish transported prefabricated brigantine sections over the mountains with human porters, assembled them at the lake, and gained control of it.

“builds prefabricated brigantines boats in their different sections and then has untold numbers of porters human load bearers bring these these prefabricated pieces over the mountains to the lake they're assembled and then they loosen the lake and then now they have control over the lake right so bringing together the technology the innovations with the local manpower and this is the force directed against Tenochtitlan in the final battle”