I was using Babylon, when Persia appeared, sometimes I found that I was at War with the Persian and sometimes not. The same problem occured when Greeks apeeared. Is it just luck or controlled by some special factors? I have also met another problem. Though the Persian was at war with me, he just sent all his troops into my boundary, and stood there doing nothing. Neither trying to attack my city, nor destroying my village. What's more, the position his troops choose is not a very good tile to defence. I just wondered what had happened.