Divide and Conquer

Today is Sunday, a day of rest that some people see as the Lords day and here I find myself blogging again. And today's thought that comes to my mind. Divide and Conquer. What is the meaning of that phrase as I have heard it every so often throughout time. And what is being divided and conquered. This phrase usually refers to people being divided against themselves as a house divided against itself cannot stand. Is it the opposite of unity, is strength in numbers. And what is strength in numbers needed for anyway. Is it united we stand and divided we fall. Does Wikipedia have an entry or an answer for that. And what does this have to do with a No Police State? Have a great Sunday.