Killing civillians

I was having an argument with a friend the other day after reading an article about the deaths of a few palestinian children. I undertsand that in order to kill terrorists these children may be harmed along the way, but i dont believe that as jews we are required to kill the women and children if they are innocent and not being used to cause harm to the Jewish people. My friend disagrees and says that we should kill the men, women and children because they are all the enemy.

Well, your friend is wrong… We are forbidden to kill women and children. (see Rambam Melachim 6; 4)