It was called the yom kippur war because the Arabs attacked on
the Jewish Holiday called yom kippur
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Yom Kippur is not a person or a country, it is a holiday. The
Egyptians chose to invade Israel on Yom Kippur because of its
solemnity. They expected the Israelis to be unprepared on Yom
Kippur, which was indeed the case.
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The Yom Kippur war occurred in October of 1973, from October 6
to October 26.