That's kind of a ridiculous comparison. Those men didn't fight on the beaches because Churchill made a nice speech, they did it because they could see very clearly what the approaching Nazi army would do if they weren't stopped. Nice speeches from inspiring leaders helped - a bit - but frankly I think things would have worked out the same anyway. We tend to look at Churchill with rose tinted glasses because the Allies won the war, but he got booted out pretty quickly once the war was over for being, essentially, a bad prime minister.