1. How was trade important in the expansion of the Muslim empire?

Islamic merchants dealt in a wide variety of trade goods including sugar, salt, textiles, spices, slaves, gold, and horses. The expanse of the Islamic Empire allowed merchants to trade goods all the way from China to Europe. Many merchants became quite wealthy and powerful.

They had not expected to find thousands of dead or dying prisoners

Explanation:

One of the main things that made concentration camps so horrific was the way the prisoners were treated. They were malnourished, over-worked (sometimes to the point of death), tortured, raped, and put to death in gruesome and inhumane ways.