the Nile river helped Egypt. It flows north and it leaves silt on its banks in the spring time. Silt is like really good potting soil so the farmers can grow their crops. The Nile river has two main sources and they both go to Egypt. There are three sources to the Nile river the first one is the blue Nile and that one that is. Rough and you will barley make it through that one the next one is the white Nile and that's the one that is more calm and you will make it through. And the last one are the rapids and you'll die if you try to make it through that. Egypt was really hard to attack. So the other tribute will be tired if they do make it there alive to fight and the Egypt people will be well rested to fight.