Combat and Conflict in Judaism
That being said, Nahmanides ruled that there is an existing commandment to conquer the land of Israel. There have been many commentators, however, who have interpreted this ruling as a call to conquer the land by settling it, as oppose to militarily capturing it.
As scholar Michael Walzer points out, distinguishing between commanded and permitted wars is very different than distinguishing between just and unjust wars. In addition, for close to two thousand years, Jews did not have the ability to fight their own wars. Thus many questions of morality (i.e., jus ad bellum, the ethics of starting a war, and jus in bello, the ethics of battlefield conduct) are under-discussed in Jewish tradition.
The issue of attacking noncombatant civilians (tohar ha'neshek--"purity of arms"--as it is called in Israeli military discourse), for example, is virtually ignored in the Jewish legal tradition (though the second-century Jewish philosopher Philo does mention a prohibition against such conduct). That being said, it is clear that ethical considerations were part of the development of Jewish laws of war.
One of the most striking such laws is the prohibition on besieging a city on all four sides. One side of a city must be left open to allow people to flee. This virtually negates the possibility of siege warfare, and indeed, according to some authorities, is the equivalent of forbidding attacks on civilians. Anyone who does not flee an attacked city can be considered a combatant.
Though defensive wars are not mentioned in Deuteronomy 20, the rabbis of the Talmud permitted--and, indeed, probably required--such battles when Jewish lives are at stake.
The reason for allowing defensive wars is not so clear. Some want to connect it to the biblically commanded obligation of individual self-defense, later summed up by the Talmud (Sanhedrin 72a) as, "If someone comes to kill you, get up early in the morning to kill him first." Other scholars object to this rationale. J. David Bleich has several problems with citing this as a source for communal self-defense, including the fact that individual self-defense is not justified if it puts innocent bystanders in danger, something war inevitably does.
Preemptive self-defense (i.e., attacking an enemy in anticipation of an attack) is much more controversial. The Talmud (Sotah 44b) seems to provide precedence for this type of military activity, referring to a war for, "diminishing the heathens so that they do not march against them." Interestingly, however, Maimonides did not codify this ruling. Nonetheless, most authorities allow preemptive strikes in situations where it is clearly in self-defense.
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