Reluctantly, while the US recognized the right of a Jewish state to come into being at the UN, and was first to recognize it, it did not send a single bullet to the Jews with which to defend themselves with when the promised invasion by the Arabs began. It's oil interests was already the State department's paramount consideration. Nonetheless, Colonel Mickey Marcus, and some 4000 volunteers from around the world, mostly Jews but also non-Jews, came to help out in this most critical period when the newborn state was invaded by 5 Arab armies promising to push the Jews into the sea. And as the film briefly notes, most of the arms and ammunition that enabled the embryonic Jewish state to survive the massive Arab attack came from Czechoslovakia, gratis Stalin, who hoped that it would turn into a Communist Jewish state. A few years later on, when that did not happen, Stalin turned against the Jews in the Soviet Union and switched his support to the Arabs.
Anyhow, as for the film itself, it's hokey Hollywood, with the usual cliches and extraneous love interest, but worthwhile just for a generalized peek into Israel's birth pangs. And especially the important part of lifting the seige of Jerusalem which was a very difficult and costly affair in terms of losses.