This local (he's in my backyard of St Paul!) rabbi, Manis Friedman, offers an enlightening vision of old testament morality. He was asked, "How should Jews treat their Arab neighbors?" Here's his answer.
I don't believe in western morality, i.e. don't kill civilians or children, don't destroy holy sites, don't fight during holiday seasons, don't bomb cemeteries, don't shoot until they shoot first because it is immoral.
The only way to fight a moral war is the Jewish way: Destroy their holy sites. Kill men, women and children (and cattle).
Fortunately, other rabbis gave slightly different answers.