1. Too Much Bluster Turned Out to Be a Grave Blunder
Unfortunately for Gamal Abdel Nasser and his allies, what might have been intended as bluff seemed all too real from an Israeli perspective. Moreover, the Israelis, who actually were prepared for war, had long been itching for an excuse to cut Nasser down to size. So on June 5th, 1967, they launched preemptive airstrikes that destroyed 90 percent of the Egyptian air force on the ground and put pay to Syria’s planes as well. With aerial supremacy secured, the Israelis then launched ground attacks that routed the Egyptians and seized Gaza and the Sinai Peninsula within three days. They also routed the Jordanians and seized Jerusalem and the West Bank within two.
Egypt and Jordan accepted a UN ceasefire but the Syrians unwisely did not. So the Israelis attacked Syria on June 9th and captured the Golan Heights within a day. Syria accepted a cease-fire the following day. The defeat was humiliatingly lopsided: about 24,000 Arabs killed vs 800 Israelis, with similarly disproportionate rates for wounded and equipment losses. It was a huge blunder by Nasser. His prestige in the Arab world, which he had sought to burnish with warlike rhetoric and demonstrations short of war, took a severe hit from which it never recovered.
Where Did We Find This Stuff? Some Sources and Further Reading