Prior to making his fateful decision to declare a Jewish state, David Ben-Gurion had been informed by French intelligence that the Arab rulers had already decided to launch a war against Palestinian Jewry and, moreover, that they were receiving clandestine support from Britain. Meir Zamir, drawing on documents in French and Israeli archives, tells the story:

Ben-Gurion found out as early as July 1947 about a British plot involving Iraqi leaders to incite war. French intelligence informed him that senior British military and intelligence officers in Cairo and Bagdad were working secretly to thwart His Majesty’s government’s decision to evacuate Palestine by sparking a general war between Jews and Arabs.

The capture of the Etzion Bloc, [a cluster of Jewish communities a few miles south of Jerusalem], by Arab irregulars, mostly from the surrounding villages, in cooperation with units of the Arab Legion, which concluded on the morning of May 13, persuaded even those Arab leaders who were still hesitant that their armies were capable of defeating the Jewish forces and of liberating Palestine. This was overwhelmingly affirmed [when] many of the residents of Kibbutz Kfar Etzion were massacred and hundreds more from neighboring settlements were taken captive and paraded in trucks through the streets of Amman to the cheers of the crowd.

Indeed, furnishing such proof was one of the objectives of the operation, whose architect was the commander of the Arab Legion, Glubb Pasha (the British officer John Bagot Glubb), who was in direct contact with the British High Command and intelligence services in Egypt. But the conquest of the Etzion Bloc also had an immediate military purpose: ensuring the functioning of the supply lines from the British Army depots at the Suez Canal to the Arab Legion.

[Likewise], British intelligence personnel and generals in Egypt manipulated King Faruq to join in the war against Israel. Among other tactics, British agents made use of the Muslim Brotherhood movement. Thousands of the organization’s members attacked and plundered Jewish and foreign property and demonstrated on the streets of the cities, demanding that the king order the army to take action to save al-Aqsa Mosque in Jerusalem and Palestine’s Muslims.

While I’ve seen much speculation—some reasonable and well informed, some quite the opposite—about why Jerusalem chose Friday morning to begin its campaign against Iran, the most obvious explanation seems to be the most convincing. First, 60 days had passed since President Trump warned that Tehran had 60 days to reach an agreement with the U.S. over its nuclear program. Second, Israeli intelligence was convinced that Iran was too close to developing nuclear weapons to delay military action any longer. Edward Luttwak explains why Israel was wise to attack:

Iran was adding more and more centrifuges in increasingly vast facilities at enormous expense, which made no sense at all if the aim was to generate energy. . . . It might be hoped that Israel’s own nuclear weapons could deter an Iranian nuclear attack against its own territory. But a nuclear Iran would dominate the entire Middle East, including Egypt, Jordan, the United Arab Emirates, and Bahrain, with which Israel has full diplomatic relations, as well as Saudi Arabia with which Israel hopes to have full relations in the near future.

Luttwak also considers the military feats the IDF and Mossad have accomplished in the past few days:

To reach all [its] targets, Israel had to deal with the range-payload problem that its air force first overcame in 1967, when it destroyed the air forces of three Arab states in a single day. . . . This time, too, impossible solutions were found for the range problem, including the use of 65-year-old airliners converted into tankers (Boeing is years later in delivering its own). To be able to use its short-range F-16s, Israel developed the “Rampage” air-launched missile, which flies upward on a ballistic trajectory, gaining range by gliding down to the target. That should make accuracy impossible—but once again, Israeli developers overcame the odds.