Why did Pope Urban II need an army?

How did disease impact the human death toll during this time period? disease killed more people than combat during this time. disease steadily increased as the war hospitals were attacked. improvements in medical technology decreased illness overall. disease was a small but significant contributor to deaths at this time.

Which 19th century technological advancement would best allow farmers along the mississippi river in iowa to quickly transport their crops to buyers in louisiana?

Which form of government have the african nations had since independence?