In June 1967 after battling Syria, Jordan and Egypt in the Six-Day War, Israel captured the entire length of the Golan Heights including its principal city Quneitra. The resulting ceasefire line (dubbed the "Purple Line" as it was drawn on the UN's maps) was supervised by a series of positions and observation posts manned by observers of the United Nations Truce Supervision Organisation and became the new effective border between Israel and Syria.