In early June 1967, tension mounted rapidly between Israel and her Arab neighbours. Nasser ordered the removal of UN troops who had monitored the Sinai front since the 1956 hostilities, and imposed a naval blockade on shipping bound for Israel's southern port of Eilat. The Israeli air force then launched quick raids against Egyptian and Syrian air-bases which left the air forces of these two states in tatters on the ground. With the Israelis in clear command of the air-space of the whole region, Israeli ground units quickly advanced against Syrian, Egyptian and Jordanian ground positions. Within six days it was all over.