This is probably biological warfare because it's not allowed according to the Geneva congress. Using poisons, toxic matters, viruses and bacteria, as well as flamethrowers and things like that are forbidden or else it will be considered a war crime and people will answer for it. It was practiced in World War 1 but was forbidden after.
Answer:
An ancient Greek historian named Herodotus called Egypt the "Gift of the Nile" because the Egyptian people depended on the great river. Each year, the Nile would overflow its banks and flood the land. When the flood subsided, it left behind bits of soil and plant life called silt that was rich in nutrients and allowed the people of Ancient Egypt to grow crops on the land. Most people lived near the Nile River as the land beyond was the Sahara Desert. Egypt's northern border is the Mediterranean Sea.
Explanation:
Talk about the three G's; Gold, Glory, and God.
Also, at the time, land was equal to power. The more land you had, the richer you were. This is a social and political reason, as well as economic.
Hope this helps you. Ask any questions if you need to!