Pegg
Jehovah our God is One
But who is the one who said I am raising up against them the Medes?
Its simply a case of God 'allowing' it to happen. In hebrew the way it is expressed is God 'causes' it...
It doesnt actually mean that he orchestrated and directed the events. It just means that he allowed it to happen. We see the same expression in the book of Genesis when God is pronouncing the consequences of Adam and Eve's disobedience. He says to Adam that the earth will grow thorns and weeds and it will be hard to toil the ground, and to Eve he says that he will increase her birth pain and she will be dominated by man....neither of these consequences are caused by God, they are not part of his plan nor do they reflect his perfect standards, rather they will occur because God will allow the consequences of their actions to come upon them.
Its the same with the pronouncement about the Medes attacking Babylon. God doesnt orchestrate the event, but he allows it to happen which is why he says "I am raising up the medes..."