To address the original OP, I personally don't believe man has 'Free will', that is a will that is free from his nature or who he is - that is the distinction that most people don't realize when they say they have free will..Man will not choose to do anything that is against who he is.
Isaiah hear shows how God's sovereignty works alongside man's yet take a close look.
The Assyrian King thinks that he himself by his will and might is defeating God's people, and to an extent this is very true he is willing to do it. Yet we also see that God is doing it, he is actually using the Assyrians as punishment..... and yet God punishes the Assyrians for doing it!
Isaiah 10;
God’s Judgment on Assyria
[SUP]
5 [/SUP]“Woe to the Assyrian, the rod of my anger,
in whose hand is the club of my wrath!
[SUP]
6 [/SUP]I send him against a godless nation,
I dispatch him against a people who anger me,
to seize loot and snatch plunder,
and to trample them down like mud in the streets.
[SUP]
7 [/SUP]But this is not what he intends,
this is not what he has in mind;
his purpose is to destroy,
to put an end to many nations.
[SUP]
8 [/SUP]‘Are not my commanders all kings?’ he says.
[SUP]
9 [/SUP] ‘Has not Kalno fared like Carchemish?
Is not Hamath like Arpad,
and Samaria like Damascus?
[SUP]
10 [/SUP]As my hand seized the kingdoms of the idols,
kingdoms whose images excelled those of Jerusalem and Samaria—
[SUP]
11 [/SUP]shall I not deal with Jerusalem and her images
as I dealt with Samaria and her idols?’”
[SUP]
12 [/SUP]When the Lord has finished all his work against Mount Zion and Jerusalem, he will say, “I will punish the king of Assyria for the willful pride of his heart and the haughty look in his eyes. [SUP]
13 [/SUP]For he says:
“‘By the strength of my hand I have done this,
and by my wisdom, because I have understanding.
I removed the boundaries of nations,
I plundered their treasures;
like a mighty one I subdued[SUP]
[a][/SUP] their kings.
[SUP]
14 [/SUP]As one reaches into a nest,
so my hand reached for the wealth of the nations;
as people gather abandoned eggs,
so I gathered all the countries;
not one flapped a wing,
or opened its mouth to chirp.’”