Using God for the state's agenda

The Nazi German army were sworn to an oath, as follows; 

I swear by God this sacred oath: That I shall render unconditional obedience to Adolf Hitler, Fuhrer of the German Reich and people, Supreme commander of the Armed Forces. And that i shall at all times be ready, as a brave soldier, to give my life for this oath.

There is a tendency for think that God is "with us" and thus, is against them--whomever "them" is (or they are)--aimed to add some obvious justification to the cause, conflict and conquest--God's will or approval.   

Can it really be possible to use God in this way; to exploit the name of God for such evil and wicked causes?   Are there other nations of war where God is used glibly, given notions that, first, the nation's actions are right and just and, second, God endorses or approves?  

Many years ago (1871), Thomas Jefferson said it right, 

Indeed I tremble for my country when reflect that God is just: that his justice cannot sleep for ever: that considering numbers, nature and natural means only, a revolution of the wheel of fortune, an exchange of situation, is among possible events: that it may become probable by supernatural interference!

Here, the relationship or order is accurately described where God is supreme and we--nor any other nation--is not.