OCTOBER 6, 1973: Egypt and Syria launch a surprise attack against Israel on the eve of the Yom Kippur holiday, striking deep into the Sinai Peninsula and Golan Heights region, both lost to Israel in the Six-Day War of 1967. After reeling from the initial onslaught, Israel counterattacks and after a week of intense fighting they take control of the Golan Heights region, while in Sinai they surround and cut off fleeing Egyptian soldiers. The Yom Kippur War escalated Cold War tensions between the U.S., which supported Israel with crucial military aid, and the Soviet Union, who had supplied Egypt and Syria with weapons. A U.N.-sponsored peace accord ended the conflict on October 25. SLIDESHOW: Yom Kippur War