On 6 October 1973, as Jews were observing Yom Kippur, the Egyptian and Syrian armies launched a surprise attack against Israeli forces in the Sinai Peninsula and Golan Heights, that opened the Yom Kippur War. The war ended on 26 October with Israel successfully repelling Egyptian and Syrian forces but having suffered over 2,500 soldiers killed in a war which collectively took 10–35,000 lives in just 20 days. An internal inquiry exonerated the government of responsibility for failures before and during the war, but public anger forced Prime Minister Golda Meir to resign.

When did the Egyptian and Syrian armies launch a surprise attack against Israeli forces?