Why did Israel have to wait for God's power to deliver them from Egypt?

Les explains that Israel was completely helpless in Egypt. They had no weapons, no arms, and no ability whatsoever to overthrow their Egyptian slave masters. They were like a locust wrapped in a spider's web, so they had to wait completely for the power of God to come in on their behalf. Les also notes that although they were organized by tribes, with Moses communicating through the heads of tribes in a chain of command, that organization did not give them the military strength to defeat Egypt. They were not a mob, but they still could not deliver themselves; God's intervention was necessary.