When Moses commanded Pharaoh to, "Let my people go," Moses told the Jewish people to grab their things and run.
During the Exodus from Egypt of 40 days and 40 nights, Moses and the Jewish people reached the Red Sea.
How would the Jewish people be able to cross the large sea?
Moses took his staff, stuck it in the water, and as the Jewish people began to walk into the water, the sea split apart, allowing all to walk through.
As Pharaoh and the Egyptian army approached this miraculous display, the water began to cease. Pharaoh and his men were drowned by the water and the Jewish people were never slaves of Pharaoh again.