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Considering Israel fought several Arab countries, which had troops largely outnumbering the Israeli, how did they manage to win the war decisively, with much fewer casualties than the Arab countries?
The Wikipedia page also lists Israel is the the only belligerent on their side (ie: they had no allies), is this true? Did Israel fight the war with no American support?
If you look only at the numbers, then Israel was bound to lose the war of course. The Arab countries had far more soldiers and they also had better/more equipment (the Soviet Union supplied them well). This view leaves out a number of important factors however:
As to whether Israel had allies in this war: no. While the USA always supported Israel they did it mostly by diplomatic means. And they supplied Israel with weapons (it was Cold War - if the Soviets supply the Arabs then USA has to supply Israel). But nothing beyond that. The newspaper I linked to above says that this result "would have been unthinkable but not for gross Arab incompetence" - and I think that this is correct.
In fact, Egypt claimed that Israel received military help from USA and Great Britain. As Wikipedia notes, these claims haven't been taken too seriously outside the Arab world. The death blow to the accusation was an intercepted phone conversation between Nasser and King Husein that Israel released to the press:
Nasser: ...Shall we include also the United States? Do you know of this, shall we announce that the U.S. is cooperating with Israel?
...
Nasser: Hello, will we say the U.S. and England or just the U.S.?
Hussein: The U.S. and England.
The Egyptians, along with Syria and Jordan, had worked up a plan to attack Israel a couple of weeks prior to the actual war. Apparently some recently declassified documents confirm that the Egyptians had planned to launch bombers against Israel to take out their airfields and other strategic military positions. They had also deployed a number of tank units that were prepared to slice through the country.
The Israelis were trying to convince Lyndon Johnson to provide support, but the US was already involved with VietNam and wasn't prepared to provide any type of military assistance in defending Israel. However. the Israelis did convince him that an attack was imminent. As a result, Johnson warned Egypt not to attack and informed the Soviet Union that if Egypt did attack, the US would hold the Russians accountable. The combined pressure from the US and Russia proved to be enough to convince Egypt to postpone their attack.
About a week later, Israel decided that the Arab countries were not going to delay much longer, so they chose to take the offensive. The Israeli air force wiped out the Egyptian and Syrian air forces while they were still on the ground, and therefore had no resistance at all in the air. Two days later the Israelis destroyed almost all of the Egyptian tanks, thereby eliminating the last opportunity the Arab countries had to mount any form of attack.
Basically, the Israelis took the initiative away from Egypt and then turned it around and did exactly what the Egyptians were planning to do to Israel. The only form of assistance that Israel received was the political intervention leading up to the actual event, and that proved to be enough.
The answer to how Israel won the Six Day War has filled numerous books and cannot be done justice in a short-form resource like this. At best, one can only give a summary in this space, but even the summaries that came before mine have given short-shrift to some key factors.
Obviously, air superiority ranks first. The Israeli Air Force's success at catching the Egyptian and Syrian air forces on the ground paved the way for full IDF control of the skies thereafter. That success came partly through planning and largely through Egypt's failure to have hardened hangers for its aircraft, adequate air defense capabilities, or better communications and control systems. Moreover, their reliance on Soviet military doctrine left very little initiative with local commanders, meaning that a shutdown of communications would keep Arab forces with their heads down. It has been rumored that Israel effectively intercepted Arab communications and made its own broadcasts pretending to be Arab leaders, giving out false and misleading orders.
Critical intelligence that came from human intelligence networks, such as Eli Cohen, and more conventional electronic intelligence (i.e. monitoring various aspects of enemy communications whether or not codes had been broken) were even more valuable to Israel. Cohen, among other things, was said to have posed as a trusted advisor to a Syrian general and made the comment that cedar trees should be planted by Syrian positions on the Golan Heights so as to provide shade to the soldiers there. The trees also provided perfect positioning points for Israeli artillery. According to Isser Harel's book, Israel also used humint from Cohen to find out what Arab soldiers were fed by their own armies; Israel made sure that it would feed POWs better and more food than they received in their own camps with the idea that the Arab fighters would feel demoralized with the knowledge that Israel had more food to feed prisoners than their own armies had to feed their soldiers.
Jordan's lateness in joining the battle allowed Israel to focus on its enemies north and south first, and after taking Sinai and the Golan Heights, Israel could focus on the West Bank without worry about its flanks. Much credit for that must be given to Egypt's Nasser who incorrectly boasted to Jordan's king that Egypt had destroyed much of the IDF's air power.
Nasser's ineptitude cannot be limited to that one incident. Prior to the war, Nasser changed his mind four times on his country's invasion strategy and goals, forcing large troop movements multiple times, thereby creating a sense of chaos among the troops, and sucking on factors such as morale and readiness.
The United States did not assist Israel in the six days war. Israel was not a client state of the United States before the six days war. The IDF did not fly American airplanes for example. The IDF flew French Mirages in 67. The special relationship between Israel and the US with regard to financial aid and military aid started after the six day war. In 1967 total US aid to Israel was $23.7 million dollars. In 1968 it would quadruple $106.5, in 1971 that number would increase again by 5 times or $634 million dollars. By 1974 total US aid was up to 2.6 billion. This is the period when the special relationship between the US and Israel really began.
As for how the Israeli's won the six day war.
They won because they attacked first and caught the larger arguable
better equipped Egyptian air force on the ground and destroyed it.(*)
Operation Focus. On June 5th 1967, (Egyptian losses: 338
aircraft and 100 pilots; Israeli losses: 19 aircraft). That set the
stage for everything which came after. It ensured that Israel would
have air superiority though out the conflict
Poor Leadership on the part of the Arabs. Egypt had a lot of
forces in the Sinai. When Israel plastered their airforce, airfields
and air defense Egyptian forces panicked and tried to retreat back
into Egypt. It was disorganized and Israel made them pay for it
dearly with their newly won air superiority. Syria and Jordan
listening to Egyptian radio reports believed Egypt was winning, and
thought they were attacking Israel when she was vulnerable. They were
mistaken and both of their air forces were either destroyed(Jordan) or
decimated(Syria) just as quickly as Egypt's had been dispatched.
You'd also have to add professionalism of the IDF to the mix.
Israel's land forces grabbed Sinai, Golan Heights, Jerusalem and the West Bank from Egypt, Jordan and Syria; increasing the size of Israel by a factor of 3.
Why did Israel attack Egypt first. Egypt and Israel had been fighting boarder skirmishes for years, so tensions were already high. Also for years the Egyptians had been denying use of the Suez Canal to Israeli shipping. But the cases belli of the attack was Egypt blockading the Strait of Tiran, blockading Israel's port of Eilat. This was Israel's only Red Sea port and it's blockade meant all her oil ( from the shah's Iran ) would have to travel around the horn of Africa which was an existential threat Israel had to respond too.
(*) 1967 was before the F-15. The United States was just starting to fly flying the McDonnell Douglas F-4 Phantom which wasn't a superior aircraft to the Soviet Mig 21. Certainly it didn't outclass the Mig as the now retired F-15 outclassed it's contemporaries.
605 F-4 Phantom aircraft were lost in combat in Vietnam, compared to 100 MiG-17's and 86 Mig-21's. (includes air to air, and ground to air losses) That's an astounding number when you consider no F-15 in 20 years of action was ever lost to air to air combat.
Anyway Israel wasn't even flying the Phantom 1967, the IDF wouldn't receive the phantom until 1969. Israel was flying the French Mirage against Egyptian and Syrian Migs.. Arguable the Mirage's were inferior planes. The professionalism and training of the IDF was the difference maker.
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