Hi DSTORM,
my opinion is that the Holy Spirit will give instructions accordingly.
It will depend on the situation.
For example, the Holy Spirit might give instructions on how to prevent the enemy to detect/ enter our homes or invade our privacy. This is in a situation if the Lord requires us to stand our ground to provide help until it's time to go.
Or if the enemy is a large force, then the Holy Spirit will give instructions on how to get to a safer place. The Lord knows the future and will give us instructions at least a few steps ahead of the enemy's planning.
However, there will be situation where we need to fight back. For example, if the enemy is torturing and raping a citizen we need to put a stop to it by force.
If we have to, we fight not because of aggresion or hate but because we love righteousness and because the Lord loves people more than we ever do.
Surely we must hate the sin, but not the sinner who commit these crimes, and the love of God compells us not to hate the people who do these wicked things.
I believe the rest have more to say about this..