'Pillar of Fire' in the Bible

Yahweh went before them by day in a pillar of cloud, to lead them on their way, and by night in a pillar of fire, to give them light, that they might go by day and by night:

the pillar of cloud by day, and the pillar of fire by night, didn't depart from before the people.

It happened in the morning watch, that Yahweh looked out on the Egyptian army through the pillar of fire and of cloud, and confused the Egyptian army.