If this is on Odysseyware The answers are
They were not able to rest or reinforce.They were running out of supplies and food.Their defensive positions each time were poor.
Answer:
They wanted the supplies not the land. they would probably use the supplies to build better buildings to help them in the future
Different interpretations
The impact was that they were trying to steal the other person's land
I THINK its B.. but i'm bot really sure.