In 1973, the United States, North Vietnam, and South Vietnam met in Paris to discuss terms of peace. Henry Kissinger, US National Security Advisor, and North Vietnamese politiboro member Le Duc Tho were the two most prominent negotiators in the peace accords. In 1973, shortly after the Paris Peace Accords, American and foreign troops in Vietnam began pulling out, with the last troops being pulled out under President Ford. A cease-fire was agreed to between the two Vietnamese nations. The Eastertide Offensive in the Vietnam War occurred in the early 1970s, proving to be costly and a failure for North Vietnam. However, communist forces established bases in South Vietnam as their failed offensive left thousands of communist troops on South Vietnamese soil. When fighting resumed in 1975, the North Vietnamese Army overwhelmed the South, causing the unification of Vietnam under communist authority. Overall, the Vietnam War had accomplished nothing as the Americans were not willing to perservere and to stay to defeat the communist North. If the Americans did stay in Vietnam, then maybe they would have won the war although the American public would be outraged to a point of fury. In the early years of the 1970s, Israel was once again at war with its Arab neighbors. The Six Day War of 1967 proved victorious for the Israelis as Eastern Jerusalem was conquered by the Israelis. Israel managed to defeat their enemies while also keeping their cities out of range from Arab artillery. The Israeli Air Force was an important factor of the Six Day War as the IAF virtually destroyed about 3/4 of their enemies' planes on the ground. Now in 1973, Israel fought another war, this time the Arab nations attacking first instead of Israel. The Arab nations attacked on Yom Kippur, the holiest and most sacred day of the Jewish calendar. Similiar to the Tet Offensive in Vietnam in which enemy forces attacked on a sacred day, the Yom Kippur War started when Arab forces crossed the Suez Canal and attacked Israel through the Sinai Peninsula. The Americans supported the Israelis after the Soviet Union began resupplying the Syrian and Egyptian armies. General Ariel Sharon broke through between two Egyptian armies. As a result, he encircled the Thrid Egyptian Army. In the North, the Syrians attacked the Golan Heights, but were repelled by Israeli forces numbering smaller than the Syrian forces. A cease-fire erected by the UN ended the war on October 24.