Final answer:
The Incan ruler who commanded a force of about 30,000 men was Pachacuti. He oversaw the expansion of the Inca Empire and conquered much of modern Peru.
Step-by-step explanation:
The Incan ruler who commanded a force of about 30,000 men was Pachacuti. During his reign, which started around 1430, he oversaw the conquest of much of modern Peru and expanded the Inca Empire. His successors, Thumpa and Wayna Qhapaq, further expanded the empire by adding territory to the south, east, and north.