Egypt and Syria launch coordinated attacks against Israel, beginning the Yom Kippur War.

Operation Badr, also known as Plan Badr, was an Egyptian military offensive and operation across the Suez Canal that destroyed the Bar-Lev Line, a chain of Israeli fortifications along the frontline of the Israeli-occupied Sinai Peninsula, on 6 October 1973. It was launched in conjunction with a Syrian military offensive against the Israeli-occupied Golan Heights, triggering the Yom Kippur War. During the War of Attrition, which preceded Operation Badr, both Egypt and Syria had been seeking to recover the territories that Israel had captured from them during the 1967 Arab–Israeli War.