Mormons at war

D&C 98:33
 33 And again, this is the ^alaw that I gave unto mine ancients, that they should not go out unto battle against any nation, kindred, tongue, or people, save I, the Lord, commanded them.

According to strict reading of this we can't fight anyone unless the Lord tell us.  Listening to the prophet counts, of course.  Did President Grant give the US permission to fight in World War II?  If not we have several apostles who fought in a bad war that was not authorized. 

I believe in the principles of this section but don't take it too far.