Tibetan sources say Deshin Shekpa also persuaded the Yongle Emperor not to impose his military might on Tibet as the Mongols had previously done. Thinley writes that before the Karmapa returned to Tibet, the Yongle Emperor began planning to send a military force into Tibet to forcibly give the Karmapa authority over all the Tibetan Buddhist schools but Deshin Shekpa dissuaded him. However, Hok-Lam Chan states that "there is little evidence that this was ever the emperor's intention" and that evidence indicates that Deshin Skekpa was invited strictly for religious purposes.
Who imposed on the military might on Tibet in the past? 
the Mongols