Was the Ming Dynasty a group? Was it ever attacked by others?

Yes there were some groups that formed among the eunuchs and the nobility that worked to gain sole power and place one of their leaders as emperor. Weak leaders were overpowered and children were often placed on the throne who had no control over their empire. At this time, the Manchu were also beginning to attack Chinese cities that existed in Manchuria, eventually gaining control first of the whole of Manchuria and then in 1644 over China, thus beginning the Qing Dynasty.