Enemies Used As Instruments of Judgment

Isaiah 10:5-11
 
5  O Assyrian, the rod of mine anger, and the staff in their hand is mine indignation. 
6  I will send him against an hypocritical nation, and against the people of my wrath will I give him a charge, to take the spoil, and to take the prey, and to tread them down like the mire of the streets. 
7  Howbeit he meaneth not so, neither doth his heart think so; but it is in his heart to destroy and cut off nations not a few. 
8  For he saith, Are not my princes altogether kings? 
9  Is not Calno as Carchemish? is not Hamath as Arpad? is not Samaria as Damascus? 
10  As my hand hath found the kingdoms of the idols, and whose graven images did excel them of Jerusalem and of Samaria; 
11  Shall I not, as I have done unto Samaria and her idols, so do to Jerusalem and her idols?