Why Yom Kippur?
The obvious reason for choosing the Jewish holiday of Yom Kippur to stage a surprise attack on Israel was that on this specific holiday (unlike any other) the country comes to a complete standstill. Yom Kippur is the holiest day in the Jewish calendar, both religiously observant Jews and most of the secular majority fast, abstain from any use of fire, electricity, engines, communications, etc., and all road traffic ceases. Many soldiers also go home from military facilities for the holiday, and Israel is more vulnerable with much of its military on leave. The war coincided that year with the Muslim month of Ramadan, when many Arab Muslim soldiers also fast. Other analysts believe that the attack on Yom Kippur actually helped Israel to more easily marshal reserves from their homes and synagogues, because the nature of the holiday meant that roads and communication were largely open and this eased mobilizing and transporting the military.