Code of Jewish Law, Laws of Shabbos, Chapter 329: If non-Jews besiege a Jewish border town — whether in the Holy Land or in the Diaspora — stating that they come only to pilfer straw, Jews are obligated to arm themselves for war, even on Shabbos, because such an intrusion opens up the entire Jewish land to attack.
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Code of Jewish Law, Laws of Shabbos, Chapter 329: If non-Jews besiege a Jewish border town — whether in the Holy Land or in the Diaspora — stating that they come only to pilfer straw, Jews are obligated to arm themselves for war, even on Shabbos, because such an intrusion opens up the entire Jewish land to attack.
