Once Israel declared her independence, she was attacked by all of her neighbors.  The Hagana, which will become the Israel Defense Forces, mobilized any able-bodied man or woman and this amounted to barely 30,000. The Arabs had significant manpower and far greater firepower and air forces. The Jews had nothing comparable. Lacking defense in depth the Jews could not afford to give ground on any of their four fronts.

But now that the British mandate was over, the Jews were able to import weapons that had previously been forbidden. The greatest Jewish resource was the dedication of their troops, and the talent of their leaders. If Israel was to hang on, she would have to survive the first two weeks.