From Wikipedia

Conquistadors

The Conquest Of The Incas

After years of preliminary exploration and military skirmishes, 182 Spanish soldiers under Francisco Pizarro and their native allies ambushed the emperor of the Inca Empire and captured him in the 1532 Battle of Cajamarca. It was the first step in a long campaign that took decades of fighting to subdue the mightiest empire in the Americas. In subsequent years Spain extended its rule over the Empire.