To my theory it would be to defend the attackers and gave Shi's men an advantage for the archers. I'm not sure if I'm correct but it's my theory.
It means success comes from everyone
Answer:
Because of the increase in labor strife and class division.
Hope this helps, have a nice day/night! :D
Christianity first began as an outgrowth of "Judaism" since this was the preexisting and predominant religion in the area and since Jesus Chris actually died as a Jew himself.